Add Papers Marked0
Paper checked off!

Marked works


Viewed works

Shopping Cart0
Paper added to shopping cart!

Shopping Cart

Register Now

internet library library
3,49 € Add to cart
Add to Wish List
Want cheaper?
ID number:339814
Published: 04.06.2011.
Language: English
Level: Secondary school
Literature: 7 units
References: Not used

Why do we sleep?
energy conservation
functional recovery of brain
regulation of our immune system
memory consolidation.

Origin of sleep
hypnotoxins - supposed hormones produced by brain tissue and inducing sleep
sleep – inner inhabition (I. Pavlov)
sleep center in our brain (V. Hess)
sleep – regulated by cerebral cortex and hypothalamous (P. Anohin)

Stage 1 - light sleep when the eyes move slowly and muscle activity slows
Stage 2 - eye movement stops, breathing becomes regular and brain waves become slower with only an occasional burst of rapid brain waves
Stages 3 and 4 (deep sleep) – it is difficult to wake someone; this is when some children experience bedwetting, sleepwalking or night terrors.…

Author's comment
Load more similar papers


Choose Authorization Method

Email & Password

Email & Password

Wrong e-mail adress or password!
Log In

Forgot your password?


Not registered yet?

Register and redeem free papers!

To receive free papers from it is necessary to register. It's quick and will only take a few seconds.

If you have already registered, simply to access the free content.

Cancel Register