Take up a relaxing form of exercise like yoga. Stress can make you gain weight. Exercise is a necessary part of losing weight and keeping it off, but it can also be a major stress factor in your life. Try practicing something like yoga instead. You will find that it is much more calming while still providing regular exercise.
Clean your teeth late at night! It may sound strange, but if you clean your teeth just before you go to bed, that sneaky midnight snack that will pile on the weight may not be as tempting. By cleaning your teeth, subconsciously you are telling your body that you have finished eating for the day.