Not only will it quench your thirst, it'll keep you active, running back and forth to the bathroom.
If you have irregular sleep patterns, direct sun exposure in the morning can help reset your internal clock. It can also give you a boost when you're fading during the day. A 2006 Belgian study found that light affects areas of the brain also involved in attention, arousal, and emotion regulation during the day, and that sunlight curbs afternoon drowsiness.
Find the nearest stairwell at work and use it. Get your soda from the cafeteria, instead of the vending machine on your floor. Instead of riding the elevator to the mailroom, take the stairs. Even if you have nowhere to go, walk up and down a couple flights when you feel yourself flagging.
Jo Dickison, 38, has had insomnia on and off for about five years, and she lets her boss know when she's having a rough week or month. "Luckily he understands," says the executive assistant in Washington, D.C. "If I finally fall asleep at 6 a.m., I'll sleep in an extra hour."