My “sweet spot” seems to be similar, I tend to get most LD’s when I wake up 6-7ish and then go back to bed after an hour or so. Probably it’s the same for most people, since REM periods become longer/more often after around 6 hours of sleep, which WBTB method utilizes
Yes, for me there is a big difference when I go back to sleep immediately (usually no results) and after waiting an hour or so, so that I would properly wake up but would still fall asleep rather easily. It’s good for WILD as well - I get a few “half-dreams” this way before actually falling asleep, sort of lucid hypnogogic imagery, very weird indeed… It’s like not a proper vivid dream, but more of a sensation of a dream yet more vivid than daydreaming.
I get by far the most LDs in the last two sleep cycles. That makes sense, since we get more REM sleep later in the night. Strangely enough, I also get LDs if I know that there is very little time to sleep. In those short nights, the lucid dreams come around 6 AM.