I always wondered about this but never really found a proper answer. I know that it's good to get at least 8 hours of sleep, because the REM periods get longer as time goes by, but what about going to bed/waking up time? For example sleeping from 12 am to 10 am vs sleeping from 10 pm to 8 am, which one would be better for lucidity?
I was reading through an article about LDing mistakes, one of them is:

Mistake #2 – Not Sleeping Right

Sleep is of course essential for Lucid Dreams. If you’re not sleeping right, which means comfortably, and while maintaining a healthy sleep cycle, then the chances are your overall health as well as your dreams will suffer.

Without going too much into detail, the natural sleep cycle relies heavily on light and darkness. The body naturally gets into the rhythm of feeling tried when it gets dark and waking up when the sun rises. It’s more complicated than that, but the basic thing to remember is to get up before 9. This will solve almost all the problems, if you get up before 9 every day after a few days any bad habits or only feeling tired at 2 in the morning will be corrected and you’ll naturally want to sleep at about 10-11pm.

This is good for dreams for a whole load of reasons, but the thing to remember here is that it will correct your sleep patterns, and you’ll be able to experience more/higher quality Lucid Dreams.
It makes sense that sleeping early makes for a good schedule, it's natural to feel sleepy when the sun sets and wake when it rises, at least relatively, right? On the other hand, when I read ETWOLD, I remember a passage from a study that said that many people tend to become lucid in the late morning. ..How are we supposed to sleep for the best chance of lucidty?