There’s two main sources of weight loss.
Any fat/carbohydrate burning done (by your metabolism to keep you alive if nothing else) will create CO2 and H2O vapor, and breathing it out will be fat/carbs that are no longer weighing you down.
Your body is constantly using water for a number of other things as well, and as that water evaporates/is wicked off by your bedding, it is (water) weight lost.
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