People who sleep only 5 hours a night are more likely to be obese than those who get the recommended 7 to 8 hours. According to a Stanford University study, this is because sleep deprivation increases the hormone ghrelin, which is an appetite stimulant, while decreasing leptin, which is an appetite controller. If you are having trouble sleeping, fix the problems that could be causing it: invest in blackout curtains, find better pillows, or try a mattress topper. You can also work on sticking to a regular sleep schedule, avoiding caffeine and nicotine at night, and not going to bed when you are hungry or have just eaten. If you tend to work on the laptop or watch TV from bed, consider banishing the electronics altogether.
For tips on how to make your bedroom more sleep-friendly, see Outfit Your Bedroom for a Better Night's Sleep