Ocean sound be my new go to favorite . I purchase this sleep sheep in desperation today after my son wake himself up from a nap and be a mess for the baby sitter all afternoon . clearly , he do not get enough sleep . I try this out skeptically -lrb- take the sound box out of the sheep and set it beside my 9 month old ... leave the sheep in the box so I could return it if it do not work -rrb- and do not expect to be impressed . I use it for the first time tonight while put my son to bed , and he have be much less restless than he usually be , only wake completely once ! the sound put he into a deeper sleep . that make it worth the $ $ to I ! - the sheep be very soft . my son be stroke it be wool as he fall asleep - I love how the sound box come out . very handy ! I have no trouble put it back in , and have take it out\/put it back in several time tonight . - I listen to the heartbeat sound in a larger version in the toy store . it do not do anything for I and do not sound like a heart beat . I do not miss it . as I say , ocean wave be my preferred choice . I be lay down with my son with this go , and it just about lull I out ! sound choice be very personal , so not everyone will like each sound . the rain fall sound be pretty generic white noise , in my opinion . I like the ocean sound because it be lower pitched and more of a rolling sound , like a big ol' barrel wave come in on the beach at night , with cricket in the background . I agree that the whale sound be odd , but maybe it would be relax to some ? the trickle water sound be relax but sort of make I have to go to the bathroom ... but anyway ... you 'll find one sound that work for you best and stay with it . I do not need option , I just need one that work ! - I wish continuous play be a option , but it do not wake my son up when the sound go off , and it be easy to push the button again . this be not a deal breaker for I . - the travel size one be perfect . I like that it be smaller - the sound be perfect . not too loud not too soft . I actually prefer not to have it up all the way , because the wave can get a little loud . they start soft and get louder at the end . great product ! I do not usually do review , but this be definitely worth it ! it sure beat stand next to my baby , say shhhhhhhhhhh like a idiot for hour on end : -rrb- that alone be worth $ to I .