More than half of Americans say they don’t get enough sleep. 57% of U.S. adults say they would feel better if they got more sleep, a new survey finds and women are more likely to not get enough sleep. The Gallup poll finds 36% of women versus 48% of men saying they get the sleep they need and younger women have the biggest issue with getting enough sleep. Younger women, at 27%, are much less likely than other age-by-gender groups to report getting adequate sleep. The amount of sleep that Americans get a night has been shrinking for decades, according to the survey. In 1942, 59% were getting ei…