This week was quite strange, F napped well (at preschool) every single day, with the last nn day being last Friday. His nights are shorter, in part because I cannot put him down early (I am alone this week as DH is away for work, so it takes little more doing all the routine by myself... and yesterday, for example, I was home at 7.30 pm after work...) and bt ends up 10-15 mins later, in part for the nap, but still they are around 10.5 h which is not bad at all if we consider a 1-1.5 h nap every day. I can see how his sleep needs vary with time, definitely he's not a stable sleep pattern. I think this time he is feeling that DH is away so his sleep patterns also resent for it and give shorter nights, so he needs to nap to compensate. Today I am expecting no nap, because he will be at MIL's in the afternoon and he often doesn't nap there, especially after so many nap days. We will see what happen.