Ever noticed that when you don’t get enough sleep, you find yourself getting sick more often? As it turns out, the two are actually linked. When you don’t get enough sleep, your cells aren’t able to regenerate thoroughly – a process which helps fight infections. Your immune system is actually less active when you’re not getting enough sleep, putting you at risk of getting sick. A study of twins showed that the twin getting even just one hour less sleep per night was making fewer proteins throughout the night, which boosts the immune system.