Long naps typically refer to sleep periods that last longer than 30 minutes, often extending to 90 minutes or more. These naps can help alleviate feelings of fatigue and improve alertness, especially if a person did not get enough sleep the night before. They can also enhance cognitive functions, such as memory and creativity, by allowing the brain to process information. However, long naps can sometimes lead to sleep inertia, a groggy feeling that occurs upon waking. This can make it difficult to return to regular activities immediately. It's important to consider the timing of long naps, as napping too late in the day may interfere with nighttime sleep patterns.