Hi,Im new to this place and I see so many of you trying hard to have Lucid Dreams so I though Id tell you what triggers mine.
Note,Ive never wanted mine so I try to avoid having them and therefore know what triggers them for me.
Reading about it def is a trigger.Same with thinking about it before falling asleep.
I didnt think about it last night but had read alot,I was extremely tired and BOOM,there it was.
Being extremely tired helps too,because then its as if my body falls asleep before my mind and BOOM,Im there again.
Getting up very early in the morning and then taking an afternoon nap when very tired,around perhaps 5-6 pm does it too.

Dont know if this helped much.
For those who go into SP first,if you want to stay " in the dream",almost always works for me trying to wake up first( cause that sure never happens).
I dont try to relax cause then I tend to just drift away into the "no dreaming,deeper sleep"
When "stuck in SP" I also try to sing or talk or whatever(this can sound very funny,haha)
And then I focus on moving around as soon as I can.

:-)