to burn the midnight oil, to stay up late working, to demonstrate, to show a fact clearly, drowsy, sleepy, irritable, cranky, major concern, something that worries you, to take a nap, to sleep during the day, to nod off, to begin falling asleep, power nap, a short period of sleep to energize, to run by, to get approval or opinion, shut-eye, informal term for sleep.

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