Sleep apnea affects about a fifth of Americans and has been linked to heart disease and brain dysfunction. It's possible that this condition is associated with lung disease as well.

As people grow old, they often face increasing health issues. While certain treatments may be helpful to younger adults, the American Geriatrics Society (AGS) has recommended some treatments elderly patients may want to avoid.

One type of sleeping pill can treat several other conditions, like insomnia, epilepsy and anxiety. But it may also weaken the immune system.

Sleep studies are being used to study children who have undergone tonsil and adenoid removal surgery to detect possible respiratory complications.