Well it used to be about 11.45am a few months ago, but now it is closer to 12.30pm mark, and will have 1.5 - 2 hours (today had an hour, odd).
Used to be asleep at 7.30 at the latest, so A time wold be 5.5 hours, but now is asleep by 8.30, so 6.5 hours.
What A time should a 21 month have? I couldn't find anything for older than 12 months..
I thought if he was going to sleep later, he would sleep in later in the morning. But he seems to wake at the same time each day regardless of what time he falls asleep (which is why w2s may work - but scared he would wake for the day if i stirred him at 5.30am) and i am not sure that doing w2s hours before will make a difference?