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Studies also have found that the less people sleep, the more likely they are to have overweight or obesity. This is partly because hormones that are released during sleep help control appetite and the body’s use of energy.

There is a lot of truth in this short section of your post, based on my experience. I have on more than one occasion, gone on a "sleep diet" and been astonished at how much weight I lost. I distinctly remember losing up to 5 pounds in a single night, several times, when I actually slept for 10+ hours, as part of a routine of sleeping that much each night.

I would weigh myself before bed, and then when I woke up, and have not gone to the restroom in between the measurements, and on certain nights see these huge losses in weight. Gut size can also reduce itself a lot when the body is kept horizontally for longer periods each day. Again in my experience.