Studies suggest that narcolepsy is far more common than most doctors realize, and it is frequently misdiagnosed.
Studies show that healthy older adults are unlikely to have more problems sleeping than younger counterparts. For those who do have problems, they may be a symptom of underlying illness.
The immune system and the body’s circadian rhythm, its internal clock, are intimately tied.
Going to sleep after experiencing negative emotions appears to reinforce or “preserve” them, research suggests.