Why do people have mental disorders?

There are many reasons why people suffer with mental disorders. Mainly, its genetic. Its a chemical imbalance in the brain. Usually its when you lack serotonin in your brain

Many disorders are caused by mutations in your DNA

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle

Some of their responsibilities are to evaluate safety, efficiency, and effectiveness of the biomedical equipment. train people on how to properly operate biomedical equipment. lastly is to research the engineering aspects of the biological systems of humans and animals.