https://www.cell.com/current-biology/fulltext/S0960-9822(23)00156-2 https://www.cell.com/current-biology/fulltext/S0960-9822(23)... AFAIK, it's established tha

https://www.cell.com/current-biology/fulltext/S0960-9822(23)00156-2 https://www.cell.com/current-biology/fulltext/S0960-9822(23)... AFAIK, it's established that white blood cells are mainly produced when sleeping. So seems reasonable that lower white blood cell count makes vaccines less effective - in the same way vaccination for people with weaker immune systems are less effective.