A list of good sleep-in guides

BBC’s awesome interactive tool lets you do two things—based on which tab you pick. You can take a quiz to figure out how your body clock works. Or you can scroll through the interactive guide to learn what your body is actually doing at any given time of the day. And if you need it: Rewire explains how you can reset your internal clock.

Mashable’s useful guide is titled 'What To Do When You Can't Sleep'—made for all of us who have tossed and turned at night, too tired to actually fall asleep. 

National Geographic’s two-minute video helps you figure out just how sleep-deprived you are—including a handy visual test and a quiz. The result may offer a very good incentive to get as much sleep as you can this weekend.