mom,

Are you talking about the traditional nightmare that involves sleep paralysis and difficulty breathing? If so I have copied a few paragraphs from the internet:

In common current usage, the term nightmare refers to dreams of particular intensity, with content that the sleeper finds disturbing, related either to physiological causes, such as a high fever, or to psychological ones, such as unusual trauma or stress in the sleeper's life. The occasional body movements seen in nightmares may have a use in awakening the sleeper, thus helping to avoid the frightening dream-situation. This can sometimes be called a "mare"

Occasional nightmares are commonplace, but recurrent nightmares can interfere with sleep and may cause people to seek medical help. A recently proposed treatment consists of imagery rehearsal (PMID 15984916). This approach appears to reduce the effects of nightmares and other symptoms in acute stress disorder and post-traumatic stress disorder.[1]

As this says they can be caused by stress which is understandable and a qualified doc should be consulted


David

Age 58 at Dx, HPV16+ SCC, Stage IV BOT+2 nodes, non smoker, casual drinker, exercise nut, Cisplatin x 3 & concurrent IMRT x 35,(70 Gy), no surgery, no Peg, Tx at Moffitt over Aug 06. Jun 07, back to riding my bike 100 miles a wk. Now doing 12 Spin classes and 60 outdoor miles per wk. Nov 13 completed Hilly Century ride for Cancer, 104 miles, 1st Place in my age group. Apr 2014 & 15, Spun for 9 straight hrs to raise $$ for YMCA's Livestrong Program. Certified Spin Instructor Jun 2014.