Wiktionary
vb. To spend the night as a guest in someone's home.
WordNet
v. stay overnight; "The boy's friends were allowed to sleep over after the birthday party" [syn: stay over]
Usage examples of "sleep over".
So I'm not going to lose any sleep over the possibility of hurting his tender feelings when I insist on reviewing any notes we send the Manties before they're dispatched.
No need for a firing squad, one spraygun would have done, but they kept the old custom, five in a row, so no single executioner need lose sleep over whose virtual bullet had killed first.
Some of them said they'd just as soon sleep over Saturday night as risk a pious shower come Sunday morning.
And for this reason it is concluded that those who by night are carried in their sleep over high buildings are not carried by their own souls, nor by the influence of the stars, but by some mightier power, as was shown above.