, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli
, and is more easily reversible than being in hibernation
or a coma
. Sleep is also a heightened anabolic state, accentuating the growth and rejuvenation of the immune, nervous, skeletal and muscular systems. It is observed in all mammals, all birds, and many reptiles, amphibians, and fish.
The purposes and mechanisms of sleep are only partially clear and are the subject of intense research.
Sleep has no favorites.
There is a time for many words, and there is also a time for sleep.
Even where sleep is concerned, too much is a bad thing.'
I have never taken any exercise except sleeping and resting.
All men, whilst they are awake, are in one common world: but each of them, when he is asleep, is in a world of his own.
Laugh and the world laughs with you, snore and you sleep alone.
Most people are walking in their sleep; turn them around, start them in the opposite direction, and they wouldn’t even know the difference.
There are two types of people in this world, good and bad. The good sleep better, but the bad seem to enjoy the waking hours much more.
Death, so called, is a thing which makes men weep: And yet a third of Life is passed in sleep.
"I love sleep. My life has the tendency to fall apart when I'm awake, you know?"