Ending your naps on a full sleep cycle can prevent grogginess.
If you can't resist napping, avoid going more than 45 minutes, or you may be vulnerable to sleep inertia, "persistent grogginess after awakening," says Dr.
Last September, Dobbs Ferry School District joined a small but growing cluster of schools around the US that have started pushing back their middle and high school start times in an effort to combat student grogginess.
The "coffee nap" trick -- drinking some java right before taking a short nap to get the biggest boost when you wake up -- also works to avoid morning grogginess.
