Haribo, I wouldn't worry too much. We get 10.5 on a bad day too, but he is best with 11.25, which seems to be his average. He's 33 months. I can honestly say it fluctuates between 10.5-11.5. At first there was a big difference between the amount of sleep he did on no nap days as opposed to nap days, but we are still evening out at 11-11.5 for both. I wish he'd do 12, but it seemed to have stopped at 12 right around 26 months or so. After that it's been no more than 11.5.