I don't know if he is low sleep needs as such but he dropped to 1 nap at 12 months so probably does have a bit less than is normal?! He turned 2 on 13th September so not long ago really. He was having earlier and longer, we were at 1.30 to 2.45 for a while. He had a little longer today, (dh in charge!) about 1.40 to 3 so I'll see what happens tonight.
Thanks for the input, I didn't realise ew was common this age. My ds1 was totally different! Napped for hours til over age 3, no problems!