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by Aaron Brady.
Original Post: Sleep inertia
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Sleep inertia is a physiological state characterized by a decline in motor dexterity and a subjective feeling of grogginess immediately following an abrupt awakening. The impaired alertness may interfere with the ability to perform mental or physical tasks.
Sleep inertia can also refer to the tendency of a person to want to return to sleeping.
When I used to stay at friends’ houses as a kid I used to experience this; after waking up (which invariably meant being woken up by someone who slept lighter) I would have to will my limbs into working — I couldn’t even pull the covers off, otherwise.