| | MySleepCenter | | Sleep Starts Most people have felt the sudden, brief contractions of muscles in the arms, legs, or head, which happen just as the individual is falling asleep. These are often felt when the individual is sleeping in a different posture than usual, for example a stomach sleeper who is trying to fall asleep on their back. These are also called hypnagogic jerks.If these movements are very strong, or very frequent, they can make it difficult to fall asleep and lead to insomnia. This disorder is a type of sleep-wake transition disorder, which is in the group of parasomnias. | |
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