Nap is a natural rhythm of human sleep cycle, which can relieve fatigue, improve mental state in the afternoon, and also play an important role in memory integration and recovery. After lunch, people are sleepy, so it is more appropriate to have a rest at this time.
Generally, taking a nap for about 30 minutes is enough for the brain to get a good rest, which is the appropriate time for the human biological clock. Taking a long nap is easy to disturb the biological clock, leading to dizziness and listlessness in the afternoon.