Weird question

Does sleeping on your stomach effect the penis size in any way just wondering. I wake up alot of mornings on my stomach.

When you wake up just tuck your penis in a lazy ass stretch, and then you'll be sleepin and workin out!

I tend to sleep on my stomach too, it takes me ages to get to sleep most nights too its strange coz i have just never been able to sleep on my back. and whenever i get morning glory it makes it difficult poor thing has nowhere to go haha which has probably led to my slight left angle and it is always tight on the left hand side compared to the right hand side of my penis when i do stretching straight out.

There's no relation at all with your penis growth If that were the case, body builders would have to sleep suspended in the air, otherwise they'd never get those big muscles :D
According to the basic explanations provided by DLD at the site/forum, this is all about cell regeneration. Cell regeneration happens no matter what position you sleep.
So I'd say you're good to sleep lying on your stomach.

I sleep on my side My penis sleeps on his back

I sleep all over the place, but I usually wake up on my back and my penis are hanging long and thick when I wake up.

This is more propone when I did BTC-BS the previous day. A maintenance routine is really important, even if you feel you have reach your desired size.