The sensation of being half conscious or only partially awake usually occurring immediately after waking up. It is also accompanied by a desire to continue sleeping.
Jim awoke early one morning for work after a rather weak-ass sleep. The force of his sleep inertia was strong that morning. So strong in fact that Jim couldn't help himself but fall back to sleep, consequently missing his shift.
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A result of not having social commitments that you care about, leading to a lack of fomo which makes you revert to a human's natural state of sleeping for hours on end.
"I slept for 12 hours last night and I'm still tired?"
"Yup probably cause of sleep inertia."
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