How do I train my self to sleep on back?

[Bigd]

Hello all
Just wanted to let you know how my back sleeping was going. The tennis ball thing worked great. My shoulder pain is very much better now I have another sleep position to go to. I now have a new set of air leaks to deal with but I think some adjustment on the head gear will take care of it. The leaks are not big enough to effect therapy , they just blow on my eye lashes and bother me. One problem at a time. Thank you all for your help.
Bigd