How many times does a human dream while sleeping?

Source: answers.com

Everyone dreams while they are sleeping but not everybody remembers it, so if people tell you they don’t have dreams, they are lying, or mistaken. Yes, but not everyone remembers them when they wake up.

Humans dream every ½ hour and seldom remember most of them and that’s because they are in total REM sleep (meaning a deep sleep with eyes moving back and forth under closed eyelids.)

When a person is stressed out they are not in total REM sleep (tossing/turning) and it’s the last few seconds just before waking up that an individual can remember a dream or nightmare.