When a person in stage 1 sleep suddenly awakens with a start, psychologists say they have experienced a hyp_nic j_erk. It is also called sleep starts.
A hyp_nic j_erk is a sleep state referred to as the sleep starts, which is associated with contractions of the body.
A hyp_nic j_erk is associated with muscle contractions that occur just as a person is falling asleep.
The muscle contractions during are sudden, strong and involuntary muscle contractions.
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