15. You Don’t Drink it When You’re Tired
You don’t always need coffee to stay awake. Not only should you drink plenty of water during the day to stay hydrated, but you should also reach for a glass when you start feeling groggy. “In fact, even slight dehydration can significantly drain your energy levels,” explains Erin Palinski-Wade, RD, CDE. That’s because your brain is made of 80 percent water, so your mental abilities and functions seriously depend on it. Sip on a glass, and mental flexibility automatically improves by 14 percent, according to one UK study.