Good quality sleep is incredible for your health, thanks partly to your immune system.

The immune system and other body systems work together while you’re sleeping at night to help repair and maintain your body.

The health benefits are clear. Getting enough good quality sleep on a regular basis lowers your risk of getting a cold or the flu. It also reduces your risk of a slew of chronic health conditions, including heart disease, cancer, and major depressive disorder. (Sleep supports physical and mental health.)

But chronic lack of sleep may lead to major health issues.

We’ve partnered with Olly to shine a light on some of the amazing things your immune system gets up to while you’re slumbering.