don't have an answer but just letting you know i'm going thru the same thing. ds is a tummy sleeper and rolls tummy to back. he's been rolling for about a month, too, but this past week his nightwakings have been really bad - almost at every 45min mark until midnight! i've been so tempted to let him cio but i know that would be unfair to him.
some moms say to block the roll, which i've tried but doesn't prevent him from doing it later on (when i'm konked out). i've tried rolled up towels and blankets, pushing him against the bumper, etc etc. nothing works!
hope someone out there can give us an answer :?
i'm sure sleeping on his side is ok. my ds ends up in all kinds of bendy positions no matter how many times i readjust.
hang in there! let me know if your lo gets over this