Dreams... What are they? Probably easiest explanation is your subconscious mind thinking and sorting information. But truth is no-one really knows what causes dreams and why some folk seem to have vivid colorful dreams and others have short uneventful ones.
Dreams mainly occur during Rapid Eye Movement (REM) sleep. REM occurs every one and a half hours throughout sleep cycle. During REM eyes move from side to side and body is relaxed and almost incapable of movement.
Have you ever declared, "I never dream."? Well you're wrong. The fact is everybody dreams every night. You just may not be able to remember your dreams.
Don't worry too much if this is case. Not remembering dreams doesn't mean you're abnormal in any way. While most people do remember their dreams, memory is fleeting and occurs mainly when sleeper first awakens.
If you really want to remember your dreams, best way is to instruct yourself to do this before falling asleep. This programs subconscious mind (where dreams come from) to hold on to memory.
When you wake up, try and hold dream in your mind until you have a chance to record it. The easiest way to do this is to have a notebook and pen or a personal voice recorder beside your bed, so you can write down dream before it disappears and gets 'buried' by normal thoughts and concerns of everyday life.
With a bit of practice you'll find little snippets of your dreams beginning to reveal themselves. This procedure will also work well for those who remember occasional dream or those who want to remember every dream they have.