In a 2005 National Sleep Foundation (NSF) Poll, more than half of people reported at least one symptom of insomnia (difficulty falling asleep, waking up a lot during the night, waking up too early and not being able to get back to sleep, or waking up feeling un-refreshed) at least a few nights per week within the past year. Thirty-three percent said they had at least one of these symptoms every night or almost every night in the past year. The two most common symptoms, experienced at least a few nights a week in the past year, included waking up feeling unrefreshed and waking up a lot during the night. A 2002 NSF Poll found that 63 percent of women (versus 54 percent of men) experienced symptoms of insomnia at least a few nights per week.