sleep up

(Verb) To get all the rest one needs. Implies sleeping late rather than going to bed early.

"I'll let you sleep up in the morning; I know you have a long drive ahead of you."

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sleep up

To have sex with a man or woman of a higher caliber, class, or financial status, than the last one you had.

Stop dealing with low class men/women.

"Girls, stop going after these broke-ass dudes. You need to sleep up".
"How many times do I have to tell you? Sleep up"!

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sleeping up in the tree

verb.
Escape an enemy by any means necessary, like in this case - "sleep on trees" in order not to get seen, not to get focused in the line of sight of an enemy

"..Drunk like thieves, take it just like the breeze,
Now look at all the clowns there, sleeping up in the trees.."
© Warcloud - "Mad Axes"