There are a variety of products on the market that claim to help your power nap. But do they really work? And if so, how do they work? First, let's define what a power nap is. A power nap is a short sleep that you take during the day in order to refresh and rejuvenate yourself. It's different from a regular nap in that it's usually shorter (20-30 minutes) and taken during the day instead of at night. So, do power nap products actually work? The answer seems to be yes - but not for everyone. Some...