> You either know you are getting restful sleep or know you are not Not true. A lot of people with chronic sleep problems (e.g. sleep apnea) feel tired during

> You either know you are getting restful sleep or know you are not Not true. A lot of people with chronic sleep problems (e.g. sleep apnea) feel tired during the day but have no idea why, and don't wake up during the night or have any other direct symptoms that would lead them to have a strong hypothesis for "bad sleep" being the root cause.