Yep, I do too. I have an erotic dream, then half wake up, realizing that my cock is stiff. I reach down, and I'll usually feel precum flowing down my cock...sometimes it flows down and my balls are all coated and slippery. I get some precum on my fingertip, and rub right on the frenulum and glans. Once enough precum is present, I can stroke my cock, lubed with my precum.
It used to be a tricky thing, because I would always ejaculate forcefully enough to either, A ) hit myself in the face, B ) hit the ceiling fan, or C ) launch it off to the side, to have it land who-knows-where...which sucks. Unfortunately (not because of the mess, I'm glad not to have that issue) I no longer cum with such force, or indeed...I rarely ejaculate at all anymore, due to prostate meds that I'm taking. Which sucks, because an orgasm (at least to me) doesn't feel nearly as good if I don't ejaculate.
I wish I could be there to lend you a "hand" L&D! And tongue, fingers, cock, toys...any and all!