hi, everyone.

the first lucid dreams i got were with the wbtb method with a 1:1 success/try ratio. The last 2 times i have tried this approach have proved to be futile, but even if i don't think about it, every 9th(as in if i had an ld today, i'd have one in 9 days) night i get a lucid dream with no apparent connection with me inducing lucidity.
Does anyone know what this cycle may be caused by?