“The most frequent complaint in my office is fatigue,” says Hilda Hutcherson, M.D., clinical professor of obstetrics and gynecology at Columbia University college of physicians and Surgeons. Carving out more time for sleep will obviously help, but so can hitting the gym. “You’ll feel more energetic,” she says. Also, remember that sex doesn’t have to be a marathon event. “Sometimes a quickie will do the trick,” says Jill Blakeway, a holistic health practitioner in New York City and Author of the forthcoming book Sex Again: Recharging Your Libido.