You lucky bugger.
i can't even remember my dreams.

Here's my made-in-2-seconds theory.
When you sleep turned to the left side, your heart has lesser freedom because of theadded weight of the right side. So, it does work slower. Your brain, not likeing the lesser amount of oxygen starts dreaming about worse things in hope of waking you up.

i have noticed something similar, and i thought up a possible reason.

i think it has to do with blood flow and gravity. during REM sleep, blood flow to the brain is doubled, yet blood is very susceptible to gravity. (hold one of your hands up for a bit, and it will start to tingle, feel cold, and go numb because the blood drains out). blood should pool more on the bottom-most side, leading to more activity in those areas.

i noticed that i experience more hypnagogic imagery (those colors/shapes/sparks) when i lay down on my back, and visual processing is in the back of the brain where the blood should pool.

so shouldn't good/bad dreams be constant on one side or the other between people? no, i'm guessing not. since dreams draw heavily from your memories, and memory locations in the cerebral cortex should vary from person to person.

its just a rough theory.

Spose you are in good company. The prophet muhammad in one of his sayings, stated that good dreams happen when sleeping right-side, and bad dreams when sleeping on the left side, and to tell others of your good dreams as they are from god, and discard the bad ones as they are from others.
I have noticed this too, every time i get a bad dream happening and i decide to leave it by waking up, i am on my left side.

same for me also. I noticed this years ago. If I sleep on my right side = spiritual type dreams and left side = personal/life dreams. If I lie on stomach or back I tend to have more lucid or OBEs.

I was going to start a new thread about this phenomenon after I began to notice changes in my dreams when I lie in different positions, but found this. Forgive me for thread necromancy, but I think it is better than thread redundancy.

Ever since I was small I have only been able to fall asleep on my left or right side, but recently I have found that laying on my back more comfortable, and have also noticed changes in my dreams.

I have not taken notice of the content of my dreams while laying on my left or right side, but I am realizing that I have more vivid, even lucid dreams when I sleep on my back. It is to the point that I begin to realize that i am dreaming, and can control some things that happen. I can also remember events more clearly when I awake.

Recently, I had a dream that I was in a warehouse complex with other people who were running around. I could sense a feeling of urgency, and saw a few cases with weapons inside of them that I have never seen before. I knew they were important, and had to be hidden away. There was also a short, dark haired woman with mischievous eyes that I felt an affinity toward. Soon, our complex was raided by federal agents looking for the weapon prototypes, and arresting / shooting people. The girl and I split up but before doing so, she told me her name was Mikael Hathaway or Hikael Hathaway. Either way, I wrote her a note saying 'Find me.' and before we were captured, she looked into my eyes and said 'I will.' A week later, I meet a girl that looks very similar to her.

I am uncertain if this is truly relevant, but I was very surprised when it happened.

So, I am glad to share my experience with you and learn that others are experiencing the same happenings.

Continue to practice, until you are able to fully control your dreams and fly away to true freedom before you face this world again.

Peace to everyone.

Yeah me to The positions before I sleep influence my dreams j/k I guess certain positions might help more profound sleep or the opposite... The brain being at different state of consciousness will likely experience different distinctive patterns of dreams in accordance to the sleep depth you are in.

nevermind....