When you feel tired, do you find yourself reaching for the energy that you receive from food or the restoration of a nap? Ask yourself if you are hungry (from your stomach) or are you tired or both? If you are hungry, eat. If you are tired, nap (if possible). At least ask yourself the question and discover the difference!
Of course the energy required to discern between body-centered eating and emotional eating is harder to come by when you are sleep deprived. A new study finds that those who had only 4 hours of sleep eat around 300 calories a day more than those who had a good night's rest.
http://yourlife.usatoday.com/health/story/2011/03/Sleep-deprived-people-eat-300-more-calories-a-day/45227686/1