hi aguella,
i have the very same problem with my 14 month old son, although i can only blame myself for this, when he was younger i myself stayed in the room with him until he slept, so of course he expects it now .....i suppose we all make mistakes!, anyway i put him down usually around 8 ish and like you can be in that room for 1 hour plus depending on the mood, he playes, he sits up, he stands up, he kicks, and i STAND by the cot, yes i know i am crazy, but i am having extreme difficulty breaking this, for the last few nights, i have positioned a chair outside the bedroom door and i am sitting on that OUTSIDE the room, so that hopefully i can graudually get him in the room on his own! if i say to him, lie down and go to sleep, he will lie down but ignores the sleep part somehow!!! until he is so tired he cannot keep his eyes open!!....sorry, i dont have any real suggestions for you but i am hoping someone out there somewhere will...
take care,
suzanne.