Avoid Long Naps
There’s plenty of evidence proving the value of short, 10-minute naps. Longer naps, however, can be problematic–especially if you’re already getting six to eight hours of sleep per night. . . . The sleep that you get in the middle of the day isn’t the sleep you get at night, because it’s not part of a 90- to 120-minute sleep cycle. Limit naps to 10 minutes or power through your midday slump until bedtime.