Some individuals may feel tired post-workout, especially if it was high-intensity. However, returning to sleep in the morning after a workout can do more harm than good. If you nap for too long and enter the deep stages of sleep, you may experience sleep inertia, or feeling groggy afterward. Long daytime naps also make it more difficult to sleep properly at nighttime, reducing your muscle recovery time. Power naps (no longer than 20 minutes) are a great alternative to sleeping because they support muscle recovery and improve fatigue, but won’t leave you disoriented.