I've been studying this for a few years and the consensus seems to be that the causation is bidirectional. It's definitely true that getting fat constricts you

I've been studying this for a few years and the consensus seems to be that the causation is bidirectional. It's definitely true that getting fat constricts your airways. When you lose weight, your tongue actually gets smaller, letting through more air. This is basically the same idea as losing weight in your feet and your shoes fitting differently -- weight gain or loss happens all over. But the converse is also a problem: when you can't breathe at night, your body is under stress, and that can lead to overeating during the day. There is some connection between the hormones lectin and ghrelin and lack of sleep. Not sure what the best reference is but I googled and found a few articles: https://medsleep.com/sleep-deficits-may-lead-weight-gain/ https://medsleep.com/sleep-deficits-may-lead-weight-gain/