Cut The Caffeine

Caffeine has a half-life of up to five hours, meaning it can stay in your system and have an effect on your body for over five hours after you ingest it. So, it's probably not a good idea to drink a shot of espresso at 5 p.m. if you're looking to turn in by 10. "We generally say don’t drink caffeine in the afternoon and limit your intake to two cups per day," says Dr. Arand.

Also, if you're devoted to Starbucks' seasonal lattes, Dr. Arand warns you that you might be getting way more caffeine than you bargained for, so drink with caution. "Specialty coffee can have five times the amount of caffeine found in one cup of regular coffee," she says. So, if you must have that Mocha Latte, just be sure you drink it early in the morning and not during the afternoon slump, otherwise you'll be bouncing off the walls all night.