First of all, physical fatigue does not always accelerate the metabolic level, and sleep quality will directly affect the metabolic rate. However, this process is very complicated and is not caused by a simple reason. To put it simply, although you are very tired, your body has not accelerated your metabolic level because of your fatigue, but has reduced your metabolic rate for various reasons. From the perspective of evolution, it is not difficult to understand that before the arrival of modern civilization, human life was mainly hunting and farming. In an era when food resources are scarce, if simple fatigue will increase the metabolic rate, then human beings can't reproduce so far.
Secondly, lack of sleep will make you want to eat. How do you feel when you don't get enough sleep? Hungry? Or are you just a little greedy and always want to eat? In fact, if you sleep at this time, you won't feel hungry after waking up, mostly because the secretion of "leptin" in the body is affected. If you get enough sleep, your body will secrete "leptin", which is a hormone that lets you know that you have no worries about food and clothing. But if you don't get enough sleep, your body will secrete some hormones that make you hungry. At this time, your sense of smell will become very sensitive. You will smell the barbecue fragrance floating in the wind within a few kilometers of Fiona Fang, Fiona Fang, and your desire for food will reach its peak in an instant ... Of course, this is also an indispensable skill in the process of human evolution, but it is "redundant" when used in today's rich food resources.
Simply put, if you sleep less, you will have more time to eat. Now you can order food on your mobile phone ... Maybe you want to overcome your appetite and stay up late by perseverance, but in fact most people don't have perseverance.