A nap is a short period of sleep, typically lasting from a few minutes to a couple of hours. Naps can help improve alertness, mood, and cognitive performance. They are often taken during the day, especially when a person feels tired or needs a quick energy boost. Napping can be beneficial for people of all ages, including children and adults. The ideal nap duration varies; a 20-minute nap can enhance alertness, while longer naps of 60 to 90 minutes may allow for deeper sleep cycles. Sleep is essential for overall health, and napping can be a useful strategy to supplement nighttime rest.