It’s one of those things that sound too good to be true but your body is probably already burning fat while you sleep to a certain degree. The trick is to maximise the efficiency of the fat burning phase.
Our body stores energy as glycogen in our liver and muscles as the secondary long term energy storage. The primary energy stores being fats held throughout our body. The human body only stores enough glycogen for 6-8 hours. After our glycogen stores are depleted, our body starts to metabolise fat for energy.
So the moral of the story, if you want to burn fat, then you need to allow your body to use up your glycogen supply. This can take up to 8 hours to use up after a meal, but immediately after, your fat stores will start burning off.
Have dinner early in the evening and break the fast later on in the morning. Avoid snacking after dinner and allow around 12-14 hours to lapse before having breakfast. Your body would have burned fat for approximately 4-6 hours while you’re mostly asleep.