I get pretty damn sweaty and gross when I sleep. Plus the way my line of thinking goes is; when you step out of the shower say your freshness level is 100 percent. Well it can only go down after your done showering. If you shower in the morning your freshness level starts at 100 and drops throughout the day. If you shower in the evening your freshness level starts at 100 and drops throughout the night. So when you wake up to start the day, your freshness level is like 50 percent and keeps dropping until your next evening shower.