I had a little bit of luck by pushing the morning nap later & a later bedtime as I eventually worked out that my DS2 would only really do a 10 hour night no matter what I did (until he was 4yo & once a week he did a 14hour night, but that was after 3 days at preschool with no naps) I found with my DS2 he was a Low sleep need, but could only cope with average A times, so it was a juggle & I had to decide where I wanted sleep the most... as the 5am wake ups were 100% dealt with by me, but the 8pm bedtimes meant DH kept them entertained, I opted for later bed & 6am starts to the day. Even as a 12yo my DS2 still wakes around 6am most of the time, but fortunately doesn't wake me (& fortunately on this trip away doesn't even wake his brother anymore while they share a room!!)