I did tests for weight loss. I found that you don't lose weight until you sleep. (stay up all night and weigh your self repeatedly, in the morning, no loss, but after you sleep and wake, your weight goes back to "morning weight") I found that if you don't sleep well, you don't lose as much. If you eat too late before going to bed, you don't lose as much. If you adjust your diet (however you want is my experience) to…
Lack of sleep pretty much affects every system in the body. Metabolism being no exception. Mathew Walker covers this in detail in Why we sleep .
I tracked weight loss for a month. Eating only one meal a day. I recorded multiple times a day my weight. Only in the morning did I actually record any "loss".
So, I did some tests for this. I stayed up all night to see if I lost weight in the morning like every other day, but I didn't.
I slept, woke up in the afternoon, and I had lost .5 pounds from the previous day.
Something special happens during sleep that is unrelated to a general concept of metabolism, but instead a specific process. It's like some kind of processing the bodies does that is related to weight loss/waste management that does not occur at all (or maybe only a little?) when you are awake. (my amateur assessment)