Most people drive cars, but don't really understand in detail how the
mechanics of the car works. The same goes for sleep.
Most people think that sleep is just "sleep." You close your eyes, you
fall asleep, you wake up refreshed and ready to go.
(If only it were that simple for most people!)
Just like car engines are most complex on the inside than on the
outside. Sleep is actually a little bit more complex than it looks.
There's actually a system that your body uses to fall asleep, while
using sleep to re-energize itself. I call this system the inner sleep
system.
You don't need to know all the details on how your inner sleep system
works, right now you need to know one thing:
You're probably aware that your conscious mind turns off when you fall
asleep before your more dormant "subconscious" mind takes over.
Every night, for most people, this happens automatically and it
requires your brainwaves to drop from Beta brainwaves, to Alpha
brainwaves.
http://insomniasw.blogspot.com/#