yeah you probably had too much sleep that day. There is a way of using oversleeping to promote lucidity like the CAT method. But they would be DILDs rather than WBTB, because once you've woken after say 9 hours of sleep, it's pretty tough to go back to sleep. What time did you wake up for the WBTB? I don't know why masturbation would harm your chances of LDing, but I haven't looked into it. And isn't it better for dreaming to masturbate and fall asleep than to not fall asleep at all?