I really hate to bore you with scientific articles because they tend to go into the weeds.
When I was taking courses in blood cell identification in the late 80s, and then I was a clinical scientist doing blood cell identification and morphology which was my job for 23 years, the a1c issue came up, and since I was a newly diagnosed type1, I paid attention to it. There was a Chinese study that was the first time there was proof that sleep cycles and circadian cycles regulate blood cell production. In that our bodies are resting in a regenerative state, where we have the greatest ability to produce cells, both white immune cells and red blood cells containing hemoglobin, which is the function of the red blood cell.
There were actually 2 studies. One that proves it from a negative and one from a positive, where interrupting sleep causes a decrease in hemoglobin hematocrit and red cell numbers. The latter showed an increase when anemic patients get more sleep. Since then many studies have been don which echo similar findings. most studies are studying the effects of sleep disturbance and limited sleep, but the results are the same.
I’ll paste the studies here referenced in my old text book, you can skip down to the conclusions because they can get long and difficult to read. effect of sleep duration on hemoglobin and hematocrit: observational and Mendelian randomization study | SLEEP | Oxford Academic
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