Naps are a seemingly regular part of childhood. But for many adults, there just isn’t enough time in the day to nap. Despite that, the majority of adults across the globe are seriously sleep-deprived. Napping is a quick, simple way to fill in some of the gaps and pay off sleep debt. In fact, a NASA study found that napping improves working memory performance, helping to reduce workplace errors while enhancing focus and attention. That said, the timing and duration of your nap matter. If you nap too long, you might wake up in the middle of a sleep cycle. This leads to grogginess upon waking, often called sleep inertia. Whether you’re interested in short cat naps or longer naps (like a 45-minute nap or 90-minute nap), rest assured that there are benefits to both. If you only have 15 minutes to snooze, you should utilize it and attempt to rest. However, if you can swing a nap that’s an hour and a half long, go for it! Just be sure to wake up at the 1.5-hour mark, or you may be left feeling groggier than before you laid down. Consuming caffeine before napping may help you feel more alert upon waking regardless of nap duration - as long as caffeine doesn’t affect you negatively in general.