Might not be UT or OT - we went through this at the same age with dd and I really think it was developmental. She was learning to string more and more words together so would lie in bed just talking to herself. I tried tweaking her routine all over the place and was pulling my hair out, but nothing that I did worked, and in the end, she just grew out of it. Something similar happened more recently at 28 months but we seem to be coming out the other side again. Sometimes, no matter how hard we try, there's not that much we can do!