Gentlemen: if you're running low on fuel after a poor night's sleep, but think your luck's improving because a woman is totally flirting with you right now, think again, because your dumb, REM-deprived brain is very possibly playing tricks on you. In a recent study, researchers found that men who'd missed out on just one night's sleep rated women as significantly more interested in sex than usual.

In the study, a team of researchers took 60 college students (31 men, 29 women) and had them complete a survey to determine perceived intent/interest in both sex and commitment, before and after a night of sleep deprivation. (Sample question: “When a woman goes out to a bar, how likely is it that she is interested in finding someone to have sex with that night?”)