Never skip your wake-up sun.
There is scientific proof that some exposure to early-morning sun can make you feel better all day. "Natural light calibrates your body's clock for the rest of the day," says Michael A. Grandner, PhD, a research associate at the Center for Sleep and Circadian Neurobiology at the University of Pennsylvania. If you can't find any natural sunshine (on dark winter mornings, for example), bright indoor lights or a light box might help you fake it until you make it. And unlike that also-energizing latte, you don't have to wait in line for it.