"While a few extra minutes in your warm, cozy bed might feel great, like, beyond great, it's most likely doing more harm than good," Tishman says.
"Dipping in and out of sleep in the early morning confuses both your brain and body," he adds. "When you let yourself fall back asleep you trick your body into thinking you're going back into sleep-mode. When your alarm goes off again your body and brain is surprised resulting in that foggy feeling called sleep inertia."
"Instead of hitting the snooze button, set your alarm for the time you have to be up and then actually get up at that time," says Tishman. "Easier said than done, but it's worth a try."
More: How to Become a Morning Person