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(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."
by Marbit January 31, 2009
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2
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"!
by uaintBoo August 25, 2014
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