In that case, I will stick to the current 6hr A time then. He seems to be doing fine with it and other than the occasional crying after the first 35-40min, I have no reason to think he can't handle it. Perhaps it is not related.
I honestly do not know if he is HSN! When he was a baby, his sleep was TERRIBLE and I thought he was LSN. Then we ST-ed him at 8.5months (night) and 9.5months(nap), and he started to sleep then I thought he was ASN bordering on HSN! And then once he turned 12.5months, he kinda became ASN. And now, since 16 months, he seems more ASN bordering on LSN :X Oh goodness, is it normal for a LO to be changing like this? I only know that he seems to do well when he has a total of 13 hour sleep in 24 hours. Ideally most of it over night. He slept 12 hours one night in January (pigs must have been flying that night) and he was like the perfect toddler the next morning!
No, he does not wake crying after 1hr50. Which means he should be ok, huh? When he has not had enough sleep, he does wake crying... if he has had more than 1hour 15 then it is impossible to get him back to sleep.
I gave him some ibuprofen before his nap today and he has not woken crying so far. I stuck my finger in this morning and did not feel any teeth breaking through. Felt ridges though, perhaps it is just below the gums now... he knows how to tell me when he has hurt himself but when I ask him if his teeth hurts, he always says no. So yeah, I don't know if it's really teeth... sighs...