Why Do People ‘Twitch’ When Falling Asleep?A…

Why Do People ‘Twitch’ When Falling Asleep?

A hypnagogic jerk is an involuntary muscle spasm that occurs as a person is drifting off to sleep.

The phenomenon is so named in reference to the hypnogogic state — the transitional period between wakefulness and sleep. Hypnagogic jerks are also commonly known as hypnic jerks or sleep starts.

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ultrafacts:We want to give them feed back on their effort, and…

ultrafacts:

We want to give them feed back on their effort, and we find this is a good way to do that.”

The service says the messages give donors more positive feedback about how they’ve helped their fellow citizens – which encourages them to donate again.

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