Warn your friends or coworkers that you could get grumpy as the day moves forward -- have you been getting enough rest and eating well? If not, it's time to put your health first and start saying no to late night invitations. Keeping yourself feeling strong is your responsibility -- no one is going to force you to treat yourself well. In fact, it's other people who usually are the reason you do things that aren't the best for you to do! Take your health seriously and you'll feel sunnier again.