Rylee went from two sleeps to one at about 11 months - for about 2 weeks it was yucky over dinner time as she would fall asleep having her dinner and then end up going to bed really late - but I started taking her outside at dinner time and feeding her on the patio just to give her something new to look at and to stimulate her and some fresh air to try and keep her awake until bath time and over a three week period it all fell into place. She wakes about 7.30 pm - lunch at 12 pm - bottle at 12.30 pm and she usually falls asleep on the bottle and then will sleep for an hour to hour and a half then usually bed at 7.30 pm / 8 pm - I find after five hours awake in the morning she is ready for her midday nap. They do get there in the end the changeover is just a bit yuck but not for long.
Good luck,
Laurin