Get a book and sit at the top of the stairs. I've done it here when the "natives" were restless. Otherwise, separate them into different rooms - including yours in a sleeping bag and move him once he's asleep - sit at the top of the stairs, then read your book. Scrapbooking is also a good activity.
HTH but probably not!!
FWIW, my 2 1/2 y/o doesn't always stay in bed (and even puts himself to bed after he's been up for awhile). It usually depends on when he's napped. If it's after 3PM I don't even bother putting him to sleep before 9PM.
