Persistent sleep disturbances add to the fatigue they hope to overcome. Doctors don’t know why as many as 66 percent of cancer survivors experience sleep problems in the year following cancer treatment. Despite the use of sleep aids and antidepressants, survivors continue to report fatigue and depression.

While no studies have been done to see if there’s a correlation between caffeine intake and the use of sleeping pills, it’s clear that more people need help to keep their eyes shut.

Restless legs syndrome (RLS) is a condition in which your legs feel so uncomfortable that it impels you to move around to gain relief from this feeling.