you people are hilarious.

You get body jerks during times of rest/no movement, here's why:

You mind likes to make sure your physical body is motionless before it initiates the dreaming sequence (or else you might enact out your dreams in your sleep and hurt self/others).

Your mind does this by caused a jolt-like reaction in the muscles of the body, sometimes several jerks. You brain is waiting for a response from your body i.e. you turn to your side or rub your face etc.

If your body reacts to the jerk, your mind will not initiate the sleep/dream sequence until it knows your body is at full rest (paralysis).

Now, in knowing this, you can actually trick you body into thinking your mind is ready to sleep. If you're having a difficult time sleeping there is one thing that will make you fall asleep 100% and it is being COMPLETELY STILL. Do not touch your body, no itches, no touching your stomach/sides/chest, no tweaking, it's more difficult than you think. You can consciously go through the process, even feeling the jerks and being fully conscious but also consciously choosing to not react to the jerks. If you don't move, you sleep. Practice more and you can have greater control and begin your lucid travels.

Watch here: Stop, drop and roll