Often during the day I feel the need to have a bit of a lie-down. Whether it’s been a busy day, I didn’t sleep well the night before, or for no particular reason I know of. But some will warn that you’ll be ruined for sleep that night if you nap during the day.
You may be familiar with that feeling of overwhelming sleepiness during the mid-afternoon. It’s common, occurs whether you’ve eaten lunch or not, and is caused by a natural dip in alertness from about 1 to 3pm. So, if you find yourself fighting off sleep in the middle of the day and you’re somewhere where you can have a nap, then do it.