If you regularly have a hard time getting restful sleep, you may need a sleep study. Also called polysomnography, a sleep study is a test that's used to diagnose sleep disorders. The good news?

called a polysomnogram (PSG). This may be done in a sleep disorder center or even at home. A polysomnogram -- or sleep study -- is a multiple-component test that electronically sends and records ...

Medicare covers sleep tests for certain conditions such as sleep apnea, narcolepsy, or parasomnia, but limitations may apply.