If it is very scary dreams it might be night terrors??

some info on it-

Night terror - Wikipedia, the free encyclopedia

A night terror, also known as pavor nocturnus, is a parasomnia disorder characterized by extreme terror and a temporary inability to regain full ...
www.en.wikipedia.org/wiki/Night_terror


MedlinePlus Medical Encyclopedia: Night terror

Night terrors (sleep terrors) occur during stage 3 and stage 4 sleep (deep sleep). The cause is unknown but night terrors are often triggered by fever, ...
http://www.nlm.nih.gov/medlineplus/e...cle/000809.htm


Night Terrors - Symptoms, Treatment and Prevention

Sleep terror disorder or "night terrors" is a condition that occurs during ... Night terrors usually occur 1/2 hour to 3 1/2 hours after falling asleep. ...
www.healthscout.com/ency/68/341/main.html


Sleep Education.com

Feb 24, 2009 ... Sleep terrors is also called “night terrors.” It is a parasomnia. A parasomnia involves undesired events that come along with sleep. ...
www.sleepeducation.com/Disorder.aspx?id=13