How Long Should a Nap Be? Nap Lengths and Timing That Avoid Grogginess

The best nap length and time of day, why some naps leave you groggy (sleep inertia), how a coffee nap works, and who should avoid naps.

The best nap length and time of day, why some naps leave you groggy (sleep inertia), how a coffee nap works, and who should avoid naps.