This body movement could be a hypnic (or hypnagogic) or sleep jerks/myoclonic jerk. It's also known as a "sleep start," and it can literally startle you out of falling asleep. This type of feeling is normal, and it can happen before people enter the deeper stages of sleep.
Next Steps
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Health Tips
. Reduce stress
. Stop smoking or alcohol (if using)
. Avoid caffeine drinks late evening/ night
. Reduce stress