Are you eating five small meals per day? (errr... night)
No matter what time of day or night, you're not supposed to go longer than 2-3 hours without eating something.
Also, try logging your food intake vs. your calories burned to see if your net calorie deficit is around 500 calories per day. (errr... 24/hour period)
Hope this helps!
DISCLAIMER: I am NOT an expert in nutrition, fitness, or exercise. Any advice given is only meant to be helpful based on what information I've gathered, and should not replace any medical treatment or any other true advice you may get from another source. Take it with a grain of salt, and then log that in your Foods tab!