Depending on the person, nighttime sex can also rev you up, making you bright-eyed and bushy-tailed right before trying to sleep, adds Lisa Thomas, LCSW, LMFT, DAACS, licensed relationship and sex therapist. But for other couples, it might have the opposite effect. “For the majority of people, sex is a tension reducer and relaxer,” she says. “People have sex before sleep to help them fall asleep.” Find out more…