Do you have this? Wikopedia defines it as "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. Morning sleep inertia takes two to four hours to dissipate completely, though subjects may function adequately before that time."
Function adequately? I just have a cup or two of coffee. I don't have to wait!
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