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You mentioned earlier that when people don't get enough sleep, the chance of obesity and weight gain

increases.

How does that happen?

What's the mechanism?

So there are probably many mechanisms, but one of the ones that is best understood is that we know that when you're sleep deprived, or indeed when your sleep is disrupted by anything else like, for example, sleep apnea, there are changes that occur in terms of hormone levels of hormones that regulate our appetite and our satiety.

And so even a single night of sleep deprivation can result in a dramatic increase in your

calorie intake overnight.

There have been some studies done, for example, in nurses.

So there was a study done that followed up nurses for 18 years, and they looked at their weight

and how much they slept on a regular basis. And what they found is that those nurses that

were sleeping less than about six hours a night on a regular basis, first of all, started off

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