Sleep-walking type behavior

I've never had a sleeping-walking problem, although about 15 years ago I had maybe three episodes of waking in the middle of the night, going to the kitchen, getting a drink and a packet of biscuits and eating the whole packet. I would then regularly fall asleep while standing up and 'micro-waking' when I finished each biscuit, so I could get another one.

Over the last few months, I've regularly woken up while already sitting up on the edge of the bed, putting on my slippers (wrong feet) and dressing gown (putting arm out where there is no arm in the dressing gown). I once got the impression I ha been doing it for an extended period.

I once woke up sitting on the floor by the bedroom door.

Another time, I was convinced there was someone outside the bedroom door, I got out of bed and stood up only to collapse, bounce off the bed and land on the floor. There was no one there, I had been asleep the whole time.

Two weeks ago, I woke up in the morning to find stuff flung around the room. The next night my glasses were missing from the bedside locker, yet to be found. I'm really short sighted, so I always leave them on the bedside locker.

Last night, I fell out of bed while dreaming, for the second time. Again stuff sent flying. Prior to these episodes I've only ever fallen out of bed once, but woke quick enough to stop hitting the floor.

At times, I've found scratches on my hands, face and ankles that I can't explain.

I've been to the doctor, he doesn't know what to do.

What do I do?