When you sleep, the body might burn fat. The more you sleep, more fat gets burned. It is best to get 8 hours sleep to speed up the metabolism, thus fat will get melted faster.
Try this mixture and try to take just this mixture and no food a few hours before sleeping.
Cinnamon ½ tsp
Vinegar 1 tsp
Freshly squeezed juice of one lemon
honey 1-2 tsp
Ginger ½ tsp
Mix all ingredients in a blender. Drink until you get desired results
This can even replace dinner.
Source and image source: healthymultiverse.com