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sleep
ellie2000
Posts: 4,692 The Mix Elder
i want to learn about sleep 
Crazy mad insane
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Just to echo what has already been said, what is it you would like to learn about sleep?
Some people can sleep too much (Hypersomnia), cannot fall asleep or struggle to (as you said Insomnia), or fall asleep at random times in the day (Narcolepsy).
There are also different stages of sleep, which correspond to different wavelengths in the brain, as well as the body's heart rate too. REM sleep (rapid eye movement) is a stage where the heart rate quickens, and your dreams are usually more intense, this is when the brain is most active. It also gets its name because most people also have eye movements, from these dreams.
There's light sleep, where your heart rate slows down and it's easier for you to wake up. Deep sleep is where your body can repair itself, and the brain waves are slower and longer, and it's harder to wake up.
Hope you found this helpful
What you are describing about feeling somewhat paralysed may be sleep paralysis. This basically happens when you're still asleep, but your brain is still active. I think it happens when you are about to wake up or just falling asleep, you're in between stages of sleep where you are still conscious. It can be quite intense and scary to experience, my brother experienced it very frequently for a while.
I hope you found this helpful, I think the NHS website may have more info if you are interested in sleep paralysis