Hi,
I have had an ileostomy now for just over a year and in the beginning I had a couple of leaks but that was only due to my stoma size changing after the surgery, since then its been pretty good. I do tend to wake up as soon as my pouch becomes full, its almost like an alarm goes off in my head and just know its time to get up and empty so I have never had a leak in bed (thankfully) I also like to have a body pillow to snuggle into it does make me feel much more comfortable when laying on my side. Good luck and take care