When we get our period we get an increase in a hormone called Prostaglandin. The duty of this particular hormone is to contract smooth muscle, this is important when trying to excrete the blood from the uterus, people who have higher levels of this hormone will experience pain and discomfort as the uterus is contracting … Read more

Depends what you mean by lack of sleep. Everyone else replied in the context that the person did not sleep at all. But I think you meant, still having sleep, but not as much as necessary for the body to regenerate? I would say that lack of sleep is known to reduce a persons immunity, … Read more