👉Blood Flow diverted to healing Process.

Digestion, exercise, thinking, and moving all require blood flow. Your body needs that blood flow to send energy and nutrients to the immune system cells to fight attacks.

👉Endogenous Steroid Activity Reduced.

Endogenous steroids are produced in the adrenal glands, and they naturally suppress the immune system and decrease inflammation.

👉Antioxidant Generation.

Sleeping increases levels of alpha-lipoic acid (ALA), which is an antioxidant that promotes healing. Antioxidants help neutralize foreign invaders to keep us healthy.

👉Sleeping increases levels of alpha-lipoic acid (ALA), which is an antioxidant that promotes healing. Antioxidants help neutralize foreign invaders to keep us healthy.

👉Boost antibody and immune response.

The most famous endogenous opioid is endorphin, and both sleeping and moderate exercise help increase this level, which is why you’ve probably heard of people feeling better after a workout. However, resting is vital for health because these boost antibody and immune response.

👉Less Exposure to External Influences.

Our innate survival mechanism tells us that it’s dangerous to go out and hunt or gather when we’re not feeling well. In a weakened state, we’re more vulnerable, and we are less likely to get hurt or make a mistake when we stay home and rest when sick.

Sources - sleepadvisor.org