My DD seems to be going through a bit of a change in routine. Previously she had two naps of about 1.5/2 hrs and 40 mins. She sleeps 12 hrs usually at night. This seems to be changing with first nap getting later and second one very short or not at all. Is one nap ok? She'll be going to creche full time in two months & her routine will drastically change then. Up about 3 hrs earlier and having to adjust to the routine of the creche re. feeding etc.