Want to increase your chances of getting lucky? As you know, nothing is guaranteed, but: let her get a little more sleep.
A study published in the Journal of Sexual Medicine has found that for women, each additional hour of sleep increases likelihood of sexy by 14%. Basically, researchers checked in with 170 women every other day to determine how much they slept, quality of sleep, and whether they’d had any sex. What researchers found was that levels of desire, genital response, and likelihood of sex went up the longer women slept.
So: let her sleep. It’ll pay off later.