How long should a sleep cycle nap be?

A full-cycle nap is often planned for approximately 90 minutes, but actual sleep cycles vary and you must also allow time to fall asleep. A 90-minute nap may include light sleep, deeper sleep and REM, potentially reducing the chance of waking during deep sleep. However, it can also interfere with nighttime sleep, particularly when taken late in the day. For a quick energy boost, a 10 to 30-minute nap is often more practical and less likely to cause prolonged grogginess. Avoid aiming for around 45 to 60 minutes if you are sensitive to sleep inertia, as you may wake from deeper sleep. The right nap depends on your schedule, sleep debt and nighttime sleep quality.