Somnambulism - or sleep-walking to most of us - is something I have dabbled in over the years.
I was just about to say what my limitations of sleep-walking are, but when Mr H isn't here to tell me, how do I know where I go or what I do, as long as I wake up back in my bed? That's a strange thought.
So, to my knowledge, I have never been outside the house. Mostly I end up somewhere in the bedroom, trying to work out where I am and then gradually waking up and realising that it is my bedroom and not a dungeon or scary place I'm trying to escape from, as happened last night. A non-wandering variety is also worrying who the hell the scary person is in my bed until I realise it is my husband! Once I decided to carry the duvet into the corner of the bedroom (much to Mr H's amusement).
The furthest I have been, to my knowledge, is downstairs, switched off the house alarm, re-set it and went back to bed. I have no recollection of this but in the morning Mr H asked me about it. When he first went to Scotland I worried that I would sleepwalk and fall downstairs with no-one here to know. But having read a bit more about somnambulism I don't think I'm any more likely to do that than when I'm awake.
Somnambulism can be used as a defence for murder, and there have been several well known cases (I won't tell you about them, Google it!). Hopefully I am not doing anything untoward in my sleep, or going off for trips in the car that I don't know about, but maybe that's another reason to set the house alarm overnight!