Sleep medicine is a branch of medicine that studies how people sleep and what happens when they don't get enough sleep. It helps doctors figure out why people can't sleep and how to help them sleep better. Doctors can use sleep studies and other tests to learn more about why people can't sleep. Sleep medicine is important because research shows that getting enough sleep is important for your physical and mental health. Poor sleep can lead to health problems like diabetes, heart disease, and depression. That's why sleep medicine helps people get the rest they need so they can stay healthy and have a better quality of life.