Is more sex before bed the answer to getting a good night's sleep? "Not only do I generally agree with that, but there is some good data to support it," says Nicole Prause, Ph.D., a top sex researcher at UCLA. "But, in all of the literature and research, we don’t know if it helps improve the quality of sleep. It's never been looked at. We just know that sex can get you to sleep and to get your brain off what it's ruminating about and that can lead to better sleep."
"There is one good study done in Germany that says when you have an orgasm, oxytocin and vasopressin both go high and they stay high for at least an hour. They did an experiment where they injected male rats with vasopressin and the rats immediately started yawning like crazy. It was actually really cute. This does show that orgasms—whether it's via sex with a partner or masturbation—can help you fall asleep faster."
Filing it under future reference. ^_^