G.B.
I wouldn't worry about it but that's me, J stayed on the bottle at nap time and bed time, in my lap, in the rocker, because I wanted that close time before he got too big. He never took it to bed and kept it in his mouth all night.
He just came up to me one day and said here...he was already using a tippy cup any time he wanted something to drink. It was really easy, and he hasn't wanted one since. He was about 2 1/2.