Poor sleep is linked to a wide range of possible ailments. However, it also works the other way around. Poor sleep can also be a sign that illness is contributing to the bad sleep.

A little unconscious kick or punch from a partner during sleep isn't too bad, but if nighttime feels like a boxing match, a rare and serious sleep disorder may be to blame.

When a child has a chronic illness, it invariably affects the parents' well-being too. With childhood epilepsy, those effects occur not only during the day but during the night as well.

Rapid eye movement sleep behavior disorder ( RBD ) occurs when people act out dreams. Diagnosis of RBD may increase the risk of developing Parkinson’s or mild cognitive impairment.

If you wake up frequently throughout the night you could be at greater risk of memory loss later on, new research suggests.

Chronic fatigue syndrome ( CFS ) is a complex disorder that affects more than one million Americans. A couple of years ago, a study was released that claimed that XMRV (a gammaretrovirus ) was a contributing factor in developing CFS . But now, scientists say that is not the case.

For middle-aged women with restless legs syndrome, it's not just itching and an irresistible urge to move the legs. It also may be a risk factor for high blood pressure.

Over time, the toll that Parkinson's disease takes on the body and mind gets worse and worse. Although Parkinson's has no cure, finding it early can help patients in many ways. New research shows that early symptoms of the disease can be seen in dream sleep.