Does anyone have any idea why the body are paralysed during REM sleep, and not paralysed during deep sleep?
Thanks.
as far as I know, it’s to stop your body acting our the things you’re thinking about in your dream.
do correct me if i’m wrong.
I’ve found this information :
“The basic mechanism for REM sleep paralysis is found in the brainstem. (…) It is known that the brainstem undergoes changes in REM sleep that result in paralysis of the body’s voluntary muscles. Certain neurotransmitters, like acetylcholine, become dormant and do not communicate motor activity.
In REM Behavior Desorders, neurotransmitters are not blocked, and the voluntary muscles become tonic, or tensely contracted, allowing a sleeping person to move his or her muscles during REM. (…) Sleepers with RBD sometimes injure themselves or their bed partners. Some people have been known to leave the bed, run into a wall, run through a window, or run down the stairs. But RBD activity is usually confined to the bed and the surrounding area.”
Complete information at :
sleepdisorderchannel.net/rem/
Could you imagine your body acting out all of your dreams? It would not only be dangerous, but probably embarresing too.
The reason for your body to be paralized during REM sleep is that your body is resting and regenerating at this point, and your mind turns off the body while in REM to keep you from acting out your dream in the physical world.
There are some REM sleep disorders which stimulate neurotransmitters such as acetylcholine, instead of blocking them. The patients often make spastic movements while in REM sleep, as if they’re truly acting out their dreams.
Just what I said, Mystic 
Haha sorry about that 
I didn’t read the whole topic…