The motivation part is easy, imagine a world where there are no rules whatsoever and you have unlimited stamina and power. I think you're suffering from is a lack of self-discipline. Wanting to have LDs is easy, putting in the effort to actually have some is hard.

As for your sleep schedule, I recommend getting 8-10 hours per sleep. Whichever hours that falls into doesn't make much difference. Just make sure you don't go to bed totally sleep deprived, that'll decrease your chances of having a DILD.

Good luck and stick with it!