My 2 1/2 yr old ds has been known to cry in the middle of his day or night sleeps on and off for a few months now, but we have had a new development - now when he cries in the night and you go to his room, he might be standing in the middle of the room, or sitting on a chair. We've also found him asleep on the chair or on the floor in the morning. When he cries his eyes are open but he doesn't respond to our talking to him, although he will cuddle us. So he is awake, but not fully, and he never remembers it in the morning.

Does this sound like he's sleep-walking (I've never known a sleepwalker personally so don't really know what it's like) and should we take him to a doctor?