- published: 20 May 2016
- views: 4491
Sleep is a naturally recurring state characterized by reduced or absent consciousness, 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 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 is often thought to help conserve energy, but decreases metabolism only about 5–10%. Hibernating animals need to sleep despite the hypometabolism seen in hibernation, and must return from hypothermia to euthermia in order to sleep, making sleeping "energetically expensive."
In mammals and birds, sleep is divided into two broad types: rapid eye movement (REM) and non-rapid eye movement (NREM or non-REM) sleep. Each type has a distinct set of associated physiological, neurological, and psychological features. The American Academy of Sleep Medicine (AASM) further divides NREM into three stages: N1, N2, and N3, the last of which is also called delta sleep or slow-wave sleep (SWS).
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Guided Meditation for Sleep... Floating Amongst the Stars
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I slumber all day long for that
It will not make me sick again
I slumber every single hour
It's the same old trick again
I slumber cause I don't wanna feel
And there's nowhere to escape
I slumber since you went away
And so it's all the same to me
Could be so much fun
And so much happiness
But I'm dead I'm dead I'm dead for you
Could be so much fun
And so much happiness
But you're dead you're dead you're dead for me
My fingertips won't feel
They just wanna stay asleep
And my legs won't make a move
As long as you won't care
And your answering machine
It stays dump as long as mine
Just wanna stay alone
Won't see your face in everyone
Fake myself
Fake yourself