At least two good things often happen in bed, and now researchers at the University of Michigan Sleep and Circadian Research Laboratory believe they are related. HealthDay reports that scientists at the sleep lab surveyed 171 college-age women, who kept diaries of their sleep for 14 consecutive days and reported whether they engaged in sexual activity the next day. The envelope please….yes, longer sleep time was linked with greater sexual desire the next day. Wait, there’s more: women with longer average sleep duration said they had better genital arousal than women with shorter sleep time. How long is long? On average, the women reported sleeping 7 hours, 22 minutes.