Something weird while trying to sleep?

This has been happening to me for quite some time now and frankly I don't know if it's normal or not. Whenever I go to sleep, sometimes when I close my eyes my body just starts jumping. It only happens when I close my eyes, while I have them open it doesn't happen. My body just starts twitching and it is very annoying because it doesn't let me sleep. It sometimes goes away after a while, or sometimes I have to sit in my bed for a while and keep trying until it goes away. It mainly happens when I go to sleep while not being sleepy, but it also happens when I am sleepy. I've considered the possibility of this being caused by nerves, but I just can't find any reason for it to happen. Anyone mind giving me a hint here?
 
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