Why does a nap feel so good?

Online Answer
Beyond simply providing more energy, though, as another study points out, napping can directly improve your mood by strengthening your ability to regulate your emotions, meaning even when something bad happens, you can deal with it without getting all flustered.
Related Questions 📌
Turns out, taking a short nap post lunch is not a bad thing after all, or so says celebrity nutritionist Rujuta Diwekar. People mistakenly associate post-lunch siesta with "lethargy, obesity and fear that it might lead to no sleep in the night", Diwekar pointed out in an Instagram post.
Reduce your stress. A short dose of sleep during the day can help strengthen the body's ability to weather stress, especially if you're short on sleep overall. Recent research shows that naps reduce stress and strengthen the immune system in people who are sleep deprived.