H.B.
I've also had this problem with my 24-month-old. All it took was one day when he napped with me in our bed. Of course he'd rather sleep with you! ;D
My guy has been starting to prolong reading time also so I am sure to just have our selected stack of books on hand; he'd have me reading all night if I allowed it!
Since I am the one who usually gives him a bath and reads to him, my husband will come in if he's back up after being put to sleep. That seems to be more helpful.
I want to keep my little guy in the crib for as long as possible!