Ds is 2.4 and I've posted several times about his absolute crap sleep. We've now kind of accepted that this is what he does, but I would really like to know there are others like him, and whether others found the cause.
We bed share on two mattresses together on the floor and still bf when he wakes during the night, without these two things there isn't enough sleep for anyone. The issue is that often, without apparent reason, he cannot go back to sleep, and we end up downstairs, playing, cooking, reading, watching trains on tv, etc, for a min of 4 hours. He's done this since about 6mo, and we've tried almost everything, but he cannot and will not stay in the bedroom.
My dgm says my uncle was like that but changed at 2 years, so I was hopefull... But nope 
Why does he wake? It's not hunger, noise, light, darkness, thirst, tiredness, not enough tiredness, routine, no routine, day of the week...
I would really love to sleep 