i'm having the same questions at the moment!

ollie usually has two 1 hour sleeps during the day, but didn't go down until 8-9-10pm.. and it was getting really hard for me. (times like that i wish i could say, 'hey, your turn!')
but he started daycare and would only sleep once there, and i noticed that if i made tea early (about 5.30) he'd have tea, have a bath, some tucker then sleep! it was awesome! it didn't help him sleep better through the night though, i think it's something he'll learn gradually.

thing is now, implementing it at home without the distractions of daycare is harder. he'll usually have a sleep around 11 for and hour/hour and a half but starts getting tired again around 4/5 o clock.. so it's a question of letting him sleep then, then having him awake til 10 or not let him sleep until 6/6.30.. i try go with the second, for both out sanities! he ends up with more sleep that way.
recently though, i've been letting him have a mini nap (15 or so minutes) at about 4.. it means he doesn't go to sleep until 7/7.30 but he's happier, so i might stick with that unitl he's ready to go to one sleep entirely.

i do feel kinda bad for 'forcing' him not to sleep.. but in the end it's better..

so i don't know if that's helpful ar all but go with what you feel is best for you and your situation (and sanity) i guess