You powered through 9 hours of your favorite show, and you did it right. You drank plenty of water, snacked on dry popcorn, and walked around the house every hour. But it’s 4:30 in the morning. You have to leave for work in 3 hours, and you haven’t slept. Lack of sleep can cause car wrecks, bad decisions, depression, and heart disease. You need 7-9 hours a night. So binge if you must, but make sure you get to bed on time.