I am up usually at 5am and in bed by 10pm. At work it is easy - - I get in around 8:00 a.m. and make sure I drink at least 3 24oz bottles before home. I drink a cup of tea here and there and drink an additional bottle of water between dinner and sleep time. Only problem is the weekends when I am running around town with errands, chauffering kids, etc....I tend to barely get 64 oz down. Have to work on that.