Hi all. DD is 17 months and has been on one nap a day for several months. We have recently been through the dreaded 18 month sleep regression which was horrendous, but she has now gone back to sleeping through and my sanity is restored 
However, even though she is now sleeping through again, we have noticed recently that if she has a nap in the day, she will not go to bed until 10/11pm.
For example, the other day she napped from 1-3:30pm, and then didn't go to bed until midnight! She just didn't seem tired until then. She then slept until 9am, didn't nap at all in the day and then slept 7-7 that night. Another night she napped 12-3 and then didn't go to bed until 11pm.
Does this mean she is getting ready to drop to no naps in the day?? 17 months seems quite young to stop napping. Or is her nap too long? It's usually around 2/2.5 hours. Should I try waking her up after an hour or so?
Thank you 