In this post Haley is 10 months 27 days old:
Haley has learned how to sit up from laying down, and sometimes when she goes to bed, she sits back up to play. Well, I have learned that she has to figure out how to lay down on her own, or she'll just scream when I leave the room. On this night, we had a "battle of the wills" of sorts. She hollared, I let her. Then, she got quiet, so I assumed she was asleep. I went in to check on her before I went to bed, and found her like this.
I guess she got so tired, she just fell over where she was. Poor thing! I did lay her down and she went right back to sleep :) The good news is, it hasn't happened again!