Parasomnias (Last Updated - 6/25/2003)
-occur during sleep

1) Nightmares (bad dreams)
2) Night Terrors
3) Sleeptalking
4) Sleepwalking (somnambulism)

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References:

1) Kaplan USMLE Step 2 Lecture Notes: Psychiatry and Epidemiology & Ethics. Gonzalez-Mayo A. 2002. pg. 82
2) Taber's Cyclopedic Medical Dictionary: 19th Edition. 1997: pg. 1583