Hi there

I'm not sure my advice is going to help - especially since my 19 month old has been reducing me to tears at rest times this past few days

Have you tried threatening them with closing the door?
What about a new special teddy to take to bed - they can only have it if they stay in bed (new teddy might get scared or something along those lines)
if you have time - can you make a story book for them, with their photos in it, telling what they need to do at sleep time -.

Hope you find a useful strategy soon