with reference to fig1 - 3 , a co - sleeping apparatus 20 is disclosed having a mattress 22 , and three opposing vertically extending sidewalls or side panels 24 a , b , and c . the co - sleeper apparatus 20 is operatively attached to an individual adult bed b by various means discussed below ( e . g ., a connecting appendage , strap or rope ) which extends preferably between the parental mattress m and box spring bs . the appendage is preferably constructed of the same material as the structural supports of the co - sleeper itself and serves the purpose of securing the co - sleeper 20 to the parental bed b by friction / weight provided between the mattress m and box spring bs . in one embodiment , a rope or strap 26 is also connected on one end to the co - sleeping apparatus 20 and to the other end to a brace 28 , which vertically extends so that it cannot fit between the parental mattress m and box spring bs , thus holding the rope or strap 26 under tension and facilitating the free standing nature of the co - sleeping apparatus 20 without the use of any support legs . such strap / rope 26 also serves to maintain the co - sleeper 20 in position in the event torsional forces are experienced ( e . g ., the co - sleeper 20 is hit in a way that may cause it to rotate horizontally , thus creating undesired gaps between the co - sleeper 20 and the parental bed b ). as one will appreciate , without the use of any ground contacting support legs , the present invention is simpler , easier and more cost effective to construct than prior art devices . moreover , without support legs , it is possible to place items underneath the present co - sleeping bed , including dressers , trunks , bassinets , storage devices , etc ., that would not otherwise be possible if ground supporting legs were attached thereto . other unique aspects of one embodiment of the present invention include the absence of any right - angled corners between the connecting side panels 24 a , b , c . thus , in a preferred embodiment , the corners 30 a , b of the co - sleeping apparatus 20 are curved and / or rounded such that no sharp edges are exposed either on the interior or exterior of the co - sleeper 20 , further addressing safety concerns . moreover , the side panels 24 a , b , c themselves are preferably made of non - rigid material , more preferably comprised of either a transparent and / or semi - transparent material . for example , a fish net material can be utilized so that one can view a sleeping infant and / or pet by looking through the side panels 24 a , b , c . prior art devices teach sides having either a spoked configuration and having solid vertical supports ( see , e . g ., u . s . pat . no . 5 , 293 , 655 to van winkle et al . ; u . s . pat . no . 6 , 112 , 347 to tharalson et al ., etc .) or solid support walls ( see , e . g ., u . s . pat . no . 5 , 148 , 561 to tharalson et al .). in a preferred embodiment of the present invention , a top supporting rail 32 is provided from which material 34 , preferably such as fish net material or other at least semitransparent and / or breathable material ( e . g ., which allows air flow there through ), descends from such support rod structure 32 . although various connecting structures ( e . g ., either vertical or angled in nature ) can be used to connect the top support rail 32 to the mattress support 44 , it is not necessary in various embodiments of the present invention which rely merely upon the tensile and connecting strength of the flexible material 34 to connect the mattress support 44 to the above - supporting rod 32 ( e . g ., in a hanging configuration ). referring to fig2 and 3 , in one embodiment , a safety strap 26 is provided that connects the co - sleeper 20 to the opposite side of the parental bed b . a locking anchor 28 is associated with one end of the safety strap 26 opposite to the side of the bed where the co - sleeper 20 is positioned . as shown in fig4 one embodiment of the present invention relates to the connectability of the co - sleeper 20 to the parental bed b . although any suitable means can be used to reversibly associate the co - sleeper bed 20 to the parental bed b , in one particular embodiment , a spring - loaded lock and release pin 36 is utilized in order to afford relatively easy reversible connection and disconnection of the co - sleeper frame 38 to the adult bed support 40 . in a preferred embodiment , a spring - loaded lock and release pin 36 is utilized to reversibly connect and disconnect the co - sleeper frame 38 from the adult bed support 40 . for example , by pulling against a spring biased pin 36 , the co - sleeper frame 38 can be disassociated from the adult bed support 40 , and by aligning apertures in the adult bed support 40 with the locking pin 36 , the pin 36 can be sprung into locking engagement therewith , thus securing the co - sleeper bed frame 38 to the adult bed support 40 in a suitable fashion . other securement means between the adult bed support 40 and the co - sleeper frame 38 can obviously be utilized and more than two connection points between the adult bed support 40 and the co - sleeper frame 38 are clearly within the scope of the present invention . as may be appreciated by one of skill in the art , various vertical supporting structures 42 can be used to connect the co - sleeper mattress support 38 to the upper support bar / railing 32 forming the upper region of the sidewalls 24 a , b , c surrounding the co - sleeper bed 20 . each of such vertical supports 42 can be provided in a telescoping and / or other similar arrangement whereby the height of the sidewall 24 a , b , c of the co - sleeper 20 can be adjusted in a desired fashion and thereafter locked into the desired height configuration . one advantage of one embodiment of the present invention is that it does not utilize integral , rigid vertical supports between the co - sleeper mattress support 44 and the top supporting rail 32 , thus permitting the collapsability of the present device , making storage and / or transport of the co - sleeping apparatus 20 far easier . for example , the co - sleeper mattress support 44 can be essentially collapsed to be co - planar with the top support rail 32 making it essentially flat . the parental mattress support rods 42 ( running vertically when supporting the co - sleeper apparatus ), can be either telescopically disassembled and / or simply pivotally attached to the support rail 32 such that the entire unit can be collapsed / folded into an essentially flat configuration . as one will further appreciate , any of the telescoping members mentioned herein can be connected by an elastomeric member , thus making the attachment and detachment of such members relatively easy without concerns with respect to losing corresponding telescoping members , and / or encountering difficulties in constructing of such unit . referring now to fig5 in one aspect of the present invention , the adult bed support 40 is an elongated , substantially rigid , between - the - mattress support that may be used to support the co - sleeper apparatus 20 . the adult bed support 40 is preferably constructed of rigid flat or tubular members , and may included surface texturing or laterally extensive attachments ( not shown ) that assist in developing stabilizing frictional forces . accordingly , the elongated , substantially rigid , between - the - mattress support 40 may be sized to take advantage of the weight and friction stabilizing forces developed by placing the adult mattress m over the elongated , substantially rigid , between - the - mattress support 40 . in addition , the elongated , substantially rigid , between - the - mattress support 40 may be used in conjunction with a safety strap 26 , as also depicted in fig5 . referring now to fig6 a further aspect of the present invention is directed to the provision of various pockets 46 on or about the co - sleeper apparatus 20 to facilitate the holding of desired items , such as lotions , diapers , powders , baby wipes , food items , liquids , etc . that one may wish to have in close proximity to a baby and / or pet . preferably , pockets 46 are provided around the outside of the sidewalls 24 a , b , c of the co - sleeping apparatus 20 , although they can be provided in the interior as well as the exterior of the co - sleeping apparatus 20 . moreover , such pockets 46 may even descend beneath the mattress platform 44 , either around the outside thereof or more centrally located beneath the mattress 22 itself . in such a manner , larger pockets can be used for a hamper for baby &# 39 ; s clothes ( whether clean or soiled ) and separate pockets can be utilized for the storage of diapers ( whether clean or soiled ). in particular , a plastic lined hamper may be provided , connected either to the sidewall 24 a , b , c or beneath the mattress 22 which can hold soiled diapers and which can be reversibly opened and closed so as to reduce the unpleasant smells of soiled diapers . in a preferred embodiment , one or more of the pockets 46 or hampers described above can be reversibly attached to the co - sleeping apparatus 20 , such as through the use of hook / loop structures ( velcro ™); snaps ; buttons ; and other suitable attachment means that will occur to those of skill in the art . referring still to fig6 other features of the present invention that are not present in the prior art include the adjustability of the height of the sides of the co - sleeper . this can be accomplished , for example , by having telescoping rail support members 42 so that the height of sidewalls 24 a , b , c can be adjusted by maneuvering at least two separate members vertically and locking / fixing them in place ( e . g ., using spring loaded lock pins , etc .). in addition , a floor support 47 may be used to add additional support for a large pet or weighted pocket or hamper referring now to fig7 a further aspect of the present invention relates to a cover 48 for the co - sleeper apparatus 20 . a suitable cover 48 can merely consist of a hard and / or soft material covering the top supporting rail 32 of the co - sleeper apparatus 20 so as to preclude undesired amounts of light from entering into the co - sleeper apparatus 20 ( e . g ., creating a darkened environment in which infants can sleep or nap during daytime hours ). in one embodiment , such a cover 48 is provided in a wound - up state , thus providing the ability of a parent to simply grasp one end of the cover 48 and extend the cover by pulling against a rotatable spring mechanism , thus allowing a desired amount of material to be unwound and affixed to the opposite side of the co - sleeper apparatus , thus achieving the closed top end of the co - sleeper apparatus 20 . removal of the cover 48 from one end of the co - sleeper apparatus ( e . g ., by disassociating velcro ™ material attachments , snaps , buttons , etc .) would then permit the rewinding of the material about a rotating spool at the opposite end of the co - sleeping apparatus . as one of skill will appreciate , there are various other means for reversibly extending a cover 48 over the top of the co - sleeping apparatus which can be provided , all of which falls within the scope of the present invention . referring now to fig8 still other embodiments of the present invention allow for the mattress pad 22 to be movable with respect to the upper support rail 32 , as , for example , by attaching the mattress pad 22 to the upper support rail 32 with an elastomeric material , thus providing for the “ bouncing ” of a baby or pet residing in the co - sleeper 20 . as is well known , a bouncing and / or rocking movement of an infant often calms and / or soothes the infant / pet and may promote sleep thereof . thus , in one embodiment of the present invention , one or more elastomeric members 50 are connected between the upper support rail 32 and the mattress platform 44 to provide for such bouncing movement . the elastomeric members 50 can be of any suitable type , including a rubber / plastic bungee cord - type configuration , springs , etc . further embodiments of the present invention , include various sophisticated infant calming devices in conjunction with the present co - sleeper 20 . for example , any suitable type of heating element ( e . g ., sleeping pad ) can be used in association with the co - sleeper to provide desired additional heat to the sleeper , thus mimicking a mother &# 39 ; s warm body heat . similarly , the co - sleeper 20 of the present invention can be fitted with a sound emitting device which can comprise tape / cd recordings of soothing sounds , music , mother &# 39 ; s heartbeat , mother &# 39 ; s voice , etc . such sound emitting devices can be connected to or made integral with the co - sleeper apparatus 20 , for example , by attachment to the mattress platform 44 , attachment to the overlying support rail 32 , affixed to the side wall 24 a , b , c , etc . mechanical mechanisms can also be used with the co - sleeper apparatus 20 to create a swinging , rocking , vibrating or bouncing motion of the mattress pad in relation to the overlying support rail . as can be appreciated , a more sophisticated co - sleeper apparatus 20 for infants may include the ability to not only angulate the mattress pad 22 for the infant &# 39 ; s comfort , but also a combination of bouncing , rocking , provision of heat and sound , etc . all intended to soothe or calm an upset infant and to make both the infant and the parental co - sleeping experience enjoyable . in addition , a stationary , movable , rotatable , bendable or otherwise adjustable light may be attached or manufactured as part of the co - sleeper apparatus 20 . such a light would aid the parent attending to the pet or infant , and also serve as a night - light for safety if set on a dim setting . referring now to fig9 another feature of the present invention relates to a fold - down and / or removable panel 52 which extends across the otherwise open side of the co - sleeping device 20 . this “ panel ” 52 can be a curtain , an extendable accordion - like structure , an elastomeric member , a fold down partition , etc ., and is intended to segregate the area within which the baby and / or pet sleeps from the parental bed itself . an attachment means 54 on one or both sides of the panel 52 are provided such that the panel 52 can be adjusted to permit access to the infant or pet in an easy fashion , especially given the fact that access to an infant in dark , night time conditions is anticipated . the attachment means 54 is therefore preferably of a simple and tactile design permitting an adult to detach or disengage the panel 52 from a closed position without great difficulty ( e . g ., hoop / loop velco ™ structures ; clips ; snaps ; buttons , etc .). referring now to fig1 , yet a further aspect of the present invention relates to the variable height angulation of the co - sleeper mattress 22 position . this feature provides the ability of a parent to angle the mattress 22 height so that an infant &# 39 ; s head can be raised above the height of the infant &# 39 ; s feet , thus providing some relief to infants having ear infections , nasal congestion , etc ., wherein an elevated head position may be beneficial . various means can be used to create the desired angulation of the mattress 22 , including the adjustment of one side of the co - sleeper apparatus 20 by use of straps 56 which can be snapped , attached with velcro ™, etc ., into a desired position ( e . g ., shortened or lengthened to affect desired angles ). this particular method of modifying the angulation of the mattress pad 22 works particularly well in the “ hanging ” embodiments of the present invention whereby the mattress pad 22 simply descends from the upper support rail 32 by means of a curtain of material descending therefrom . in other embodiments , however , ( e . g ., telescoping members 42 acting as vertical support rails between the top horizontally extending support rail 32 and the mattress support 44 ) vertical supports 42 on one end of the co - sleeper 20 can be reduced in height , while other support rails 42 on the opposite side of the co - sleeper apparatus 20 can be extended , thus achieving a desired angulation of the mattress 22 itself . a lateral support 57 may also be provided , wherein it too is adjustable . referring now to fig1 , in embodiments primarily intended for a pet , the present co - sleeper 20 can be provided with separate compartments 58 a , b for the storage of dog food , water , etc . indeed , in some embodiments , the co - sleeper 20 can have one or more bowls associated therewith which can hold food and / or water for a pet , thus providing the ability of a pet to not only sleep in the co - sleeper 20 next to a pet owner , but to also have access to food and water within the confines of the co - sleeper 20 . such compartments 58 a , b may be preferably positioned at different levels / planes as compared to the sleeping surface . in one particular embodiment , the co - sleeper 20 for a cat is constructed so that a portion of the mattress area 22 is accommodated with a kitty litter area , such that a cat cannot only sleep in one portion of the co - sleeper apparatus 20 , but can also urinate , etc . within the confines of the co - sleeper apparatus 20 . various containment means for a kitty litter box inside the co - sleeper apparatus 20 can be fashioned , all of which are within the scope of the present invention . height adjustment may also apply to a co - sleeper 20 for an infant . accordingly , yet a further unique feature of the present invention relates to the adjustable position of the height of the co - sleeper mattress 22 in relationship to the parental bed b . in some embodiments , it may be preferred to have both of the mattresses m and 22 co - linear with each other so that there is essentially no difference in height between the top of the parental bed b and the top of the co - sleeper bed / mattresses 22 . in other embodiments , however , it may be desired to have the co - sleeper mattress 22 slightly below and / or several inches below the parental bed mattress m , thus further ensuring that an infant and / or pet is precluded ( e . g ., by contact with the extending height portion of a parental bed ) from accidentally rolling into the parental mattress area m . alternatively , the top surface of the co - sleeper mattress 22 can extend slightly above , and up to several inches above , the parental bed mattress m , thus affording protection of an infant or pet inside the co - sleeper 20 from accidental contact with an adult sleeping in the parental bed b who may innocently roll towards the co - sleeper 20 . in such event , with the heightened co - sleeper mattress 22 level , an adult would encounter the heightened mattress 22 of the co - sleeper 20 and not be able to roll into or on to the co - sleeper 20 . as one of skill in the art will appreciate by reviewing the figures and by reviewing the detailed description of the present invention , various structural aspects of the prior art can be used in conjunction with the novel features of the present invention . as such , the following u . s . patents are incorporated herein in their entireties by this reference : u . s . pat . no . 6 , 112 , 347 to tharalson et al ., u . s . pat . no . 5 , 293 , 655 to van winkle et al ., u . s . pat . no . 5 , 148 , 561 to tharalson et al . and u . s . pat . no . 5 , 819 , 340 to kelly . for example , the mechanisms used to secure the co - sleeper to the parental bed as pictured in u . s . pat . no . 6 , 112 , 347 can be utilized with the present invention . similarly , the structures utilized in u . s . pat . no . 5 , 148 , 561 to stabilize the support of a co - sleeper with the parental bed can also be utilized in conjunction with the present invention ( e . g ., use of relatively rigid and flat horizontal supports connected to the co - sleeper mattress support base and that extend between the box spring and mattress of the parental bed ). in view of the various embodiments discussed above , it will be apparent to one of skill in the art that several of the above structural and functional features of the present invention can be combined in various ways , without the necessity of all of such features being present in one particular device . as such , the present invention may incorporate one or more of the features as set forth in prior art designs ( e . g ., the use of rigid sidewalls , ground - contacting legs , etc .) while at the same time incorporating various other novel features ( e . g ., incorporation of rocking , heat emitting , sound emitting devices ; provision of food / water / kitty litter containers within the confines of a co - sleeper ; position of diaper hampers descending from a mattress support ; retractable covers ; etc .) without departing from the scope of the present invention . while various embodiments of the present invention have been described in detail , it will be apparent that further modifications and adaptations of the invention will occur to those skilled in the art . it is to be expressly understood that such modifications and adaptations are within the spirit and scope of the present invention .