Sleepwalking Headbanging Nightmares Nightmares, neurosa nocturnus, is differentiated from a normal dream, or an anxiety dream by a variety of remarkable physiological transformations. During the nightmare the sleeper will express extreme rigidity, possible teeth grinding, increased eye movement, hyper-inflation of blood pressure, sweating at the extremities, and often, irregular and increased heart rate.
Nightmares have a surprisingly high recall rate when compared to other sleep phenomena.
Sleepwalking seems to be a genetically inheritable trait. Clerici, a prominent researcher in sleepwalking, recorded a case history of an entire family who suffered from chronic sleep walking and on more than one occasion they would all rise from their bed and meet around the dining table. This is an example of temporal sleepwalking, which means a sleepwalker will rise at the same time every night. Most sleepwalking episodes last between fifteen and thirty minutes a night. It is extremely rare for an individual to have more than one sleepwalking episode in a night.