A member asked:

Whats it called when you are so tired your brain falls asleep for a split second then you jump up ot twitch to wake up. even though you may be busy.

A doctor has provided 1 answer

Micro-sleep: Medical school. Just kidding. You can be so tired that you have a micro-sleep. Another possibility is rem intrusion into a waking state. If it continues, please see a sleep doc to rule out narcolepsy or cataplexy. Sweet dreams.

Answered 9/14/2013

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