Waking up from a refreshing nap feels great; you're focused, filled with energy, and ready for the rest of your day. But sometimes you wake up disoriented, still tired, and frustrated. So, what's the difference? According to Lifehacker, the key to the perfect nap may be its length. Some sleep experts say a 20 minute nap may be the perfect length to leave you in a good mood, while a 60-minute nap can leave you grouchy. A 90-minute nap is often too long. According to science, 30 minutes may be the key length, as that's when you typically enter deep slow wave sleep. Waking up after the 30-minute mark can make you feel disorientated, and more tired than you were before the nap. When it comes to naps, sometimes shorter is better.
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