Insects do not seem to exhibit REM sleep. ... brain stem, as it does in humans, but
does not extend at all to ...
Dec 18, 2007 ... Still, the question remains: Why do we need sleep at all? ... for example, what
happens when humans or other animals are deprived of sleep.
Researchers have also shown that after people sleep, they tend to retain
information and perform better on memory tasks. Our bodies all require long
periods of ...
Oct 19, 2013 ... Humans need sleep; everybody knows that without it, we get cranky, a bit ... for
our body's mental street-cleaners to come out and do their work.
May 15, 2015 ... Research suggests that parts of the human brain may well be asleep when it is
sleep-deprived. Studies on whales and dolphins show that ...
As people age, they tend to sleep more lightly and for shorter times, although
often ... (A) The duration of sleep each night in adults is normally distributed with
Scientists have yet to determine exactly why people sleep. However, they do
know that humans must sleep and, in fact, people can survive longer without food
What we do know is that sleep is an anabolic, or building, process. ... Human
beings can function without a full tune-up, but they will be in a state of relative
The amount of sleep a person needs depends a lot on his or her age. Babies
sleep a lot — about 14 to 15 hours a day! But many older people only need about
Oct 17, 2013 ... While you are sleeping your brain's cleaning system goes into overdrive, ... that
support every thing we do — all of our movements, our thoughts, ... so we don't
yet know how the amount or kind of sleep humans get affects the ...