To me it's just stop eating AND drinking at least 2 hrs before going to bed. My most reliable source is "burn the fat feed the muscle" book that helped me to endorse the healthy way of living this life...Here is the quote:

"I strongly recommend moving the last intake for the day as far away from bedtime as you can. 3-4 hours is ideal, but at least 2-3. This increases the length of the "fast" which in reality nighttime is - broken by breakfast. Using this method consistently is one of the most effective ways to lower body fat - and it doesn’t take a lot of effort"