1. Napping
Naps are popular for people of all ages. According to the National Sleep Foundation, about 1 in 3 adults in the U.S. take a daily nap. And though naps can help you feel more alert and rested, napping too long can actually make it harder to fall asleep at night.
If you like to nap, consider limiting yourself to a “power nap” of about 20 minutes. This gives your body long enough to rest, but not enough time to go into the deepest stages of sleep (the N3 stage of non-REM sleep). This means you wake feeling refreshed, rather than groggy. A 20-minute nap is also short enough that it won’t interfere with your nightly sleep.
2. Jet lag
When you travel to a new time zone, it can be hard for your internal body clock to adjust. This can cause a temporary sleep disorder called jet lag. Jet lag leaves
you feeling sleepy and unwell during the day — and makes it hard to sleep at night. It usually goes away on its own in a few days after your body adjusts.