It can seem uncomfortable to stay in one position and when I give up on WILD and roll over on purpose it's such a releif. Thinking about nothing is EXTREMELY tiring for me and requires lots of concentration. All of my WILD attempts in history have gone your way, I've never acheived it. Do you have a genuine urge to roll over? That's probably the cause, and to me it means I can't do WILD. I don't know if trying every night would help, but I can't tell you that because I don't. I only try rarely, but I do this because it's hard enough for me to get to sleep. I went to bed at 9:30 and could only manage to get to sleep at 3:30... that's why some people can't WILD because it's hard enough to get to sleep in the first place!