Some people will not get fat if they sleep less, which can't prove that they will get thinner if they sleep less (lack of evidence), just as the decline in their academic performance can't prove that the harder they study, the worse their academic performance will be.
There are many factors related to fatness and body absorption. Eat delicious food, eat bad food, eat more, eat less, have a good mood and have a reasonable rest.
Just like I sleep very little (sleep varies from person to person, for example, I need to sleep 16 hours a day, and there are days when I only sleep for 2.3 seconds and hardly sleep), but I am also thinner. I know very well that's because I usually eat less, eat or not, and have a rest. (Of course, none of this is boastful. )
Not enough rest, not much food, and more exercise. If you are still fat, you can beat me to death.