You’ll protect your testicles

Sleeping in your underwear increases the odds that you’ll get an infection in the worst possible place, says Brian Steixner, M.D., a urologist based in Atlantic City, N.J. Your drawers keep heat and moisture in—and bacteria thrive in warm, moist environments, says Dr. Steixner. More bacteria makes for a higher likelihood that any chaffed or irritated skin down there becomes infected, he says. Skip your skivvies to keep your balls cleaner, drier, and healthier.