I'm not really sure, to be honest. I've been drinking quite a lot of coffee recently... I think having a positive attitude and something to do helps, too.
I manage a hotel property. Bunches of rooms and truck loads of guests. All during the day I'm guzzling coffee and/or Monster energy drinks.
I've got the property and my staff and my guests to keep me occupied. When 3:00pm comes around, I retreat to my apartment and my big ol California king bed. AHhhhh ZZzzz...