Experts generally recommend seven to nine hours a night for healthy adults. Sleep scientists say new guidelines are needed to take into account an abundance of recent research in the field and to reflect that Americans are on average sleeping less than they did in the past.
Synonyms: inhabitation, domicile, habitation, home, dwelling, inhabitancy, abode, dwelling house. habitation. Abode, dwelling, and habitation are used with little difference of meaning to denote the place where one habitually lives; abode and habitation belong to the poetic or elevated style. Even dwelling is not used in familiar speech; a person says my house , my home , or more formally my residence ..
There is another distinct group of living things that live both on land and in water and they are referred to as amphibious. As for the type of habitat, the term terrestrial may also be used. Land as a habitat is called a terrestrial habitat to distinguish from water that is called aquatic habitat. A terrestrial habitat would therefore indicate the habitat specifically for terrestrial living things whereas an aquatic habitat pertains to the various shelters of aquatic living things in different water forms.