Sticking to routine and late night cravings

First, make sure you schedule your workout days as you would any other appointment. Mark your calendar with the days and times that will work best for you. Make exercise become part of your routine, whether it is first thing in the morning or right after work.
Second, change your workout routine every 2-3 weeks, or as much as you need to in order to keep it interesting and challenging. This will stimulate you mentally and physically, as your muscles will become accustomed to the same movements and weight. Third, get a workout buddy. A buddy will help you stay disciplined and motivated.

Regarding your late night/ early morning cravings, I'd like to know what is your diet like throughout the day? The reason I ask is because many clients tell me they eat healthy all day but come home after work craving something sweet. This is because they’ve avoided carbohydrates all day, instead of ingesting slow digesting carbs throughout the day. Carbohydrates can be simple or complex, the complex being the ones you want to have throughout the day. Examples include brown rice, whole grains, baked and sweet potatoes, and oatmeal. These will keep you feeling fuller, longer. Simple carbs, on the other hand, spike your blood sugar, which will give you a quick rush of energy only to be followed by a lull, leaving you craving more sweets, thus putting you into a sugar craving cycle.
My advice is to make sure you’re eating enough complex carbohydrates throughout the day. Make the necessary changes to your diet and this should stop your middle of the night cravings for sugar.