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The state of sleep when extremely loud snoring occurs. Any attempt to wake up that person is completely futile.
He sounded like a bear in hibernation mode last night, so I wasn't able to sleep at all.
by One And Only Meli October 04, 2015
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Used to describe long periods of sleep (usually 12 hours+) following a long, hard or stressful day and/or making up for lost sleep
Sorry I didn't get your message. I havnt slept for shit all week, I passed out round 10 and went into hibernation mode till 11 the next morning.
by SevenEvils October 22, 2015
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