with the onset of sleep as a signal that a sleeping primate is falling out of a tree. The reflex may also have had selective value by having the sleeper readjust or review his or her sleeping position in a nest or on a branch in order to assure that a fall did not occur", but evidence is lacking.

Diagnosis

Hypnic jerks are often mistaken for other forms of movement during sleep, including:

* Restless legs syndrome
* Periodic limb movement disorder

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