Think about this. If you are going to bed at night and you feel the need to swallow, but don't, will you fall asleep? No you wont. If you feel uncomfortable and want to roll over, but don't, will you fall asleep? No. In order to fall asleep you need to be perfectly comfortable. In order to WILD you need to fall asleep. Conclusion: The roll over signal is complete bogus.
Some people even including rolling over every 10minutes as part of their WILDing techniques.