See also :
* [[Sleep Disorders (Sleep Apnea)]]
* [[Insomnia]]
==Causes==
If you had hoped to grow out of your nightmare stage, but find that you suffer from them as an adult, too, you’re not alone. While nightmares are more common among kids, 50 percent of adults have nightmares. These frightening, too-realistic dreams can leave you feeling rattled, and in more severe cases, they can cause sleep deprivation—which is linked to heart disease, obesity, and depression. There are a number of reasons why you may have nightmares, including: