Women who don't sleep enough are at risk for excess belly fat, Mikka Knapp, RDN, LDN, CLT, founder of Bright Body Nutrition in Sarasota, FL, told POPSUGAR. But here's the kicker — women who sleep too much are also at risk for carrying extra belly fat. "The sweet spot for sleep and less abdominal fat falls between seven to eight hours a night," Knapp says. "Too much or too little sleep results in cravings for simple carbs and an imbalance of the hormones ghrelin and leptin, which help signal hunger and fullness." Try this trick to help you fall asleep faster.