Oh, I feel for you...any kind of sleep behaviour that disturbs good, restful, restorative sleep can play havoc and when you start having falls/injuries, it can feel really scary (and painful if you hurt yourself!)
I have sleep terrors, which sometimes involve me getting out of bed, though my partner is usually able to stop me before I leap so, thankfully, I don't get out too often these days.
In the past though, I've given myself a black eye by running full pelt into a door and have also ripped ligaments in my leg and have fallen over and woken myself up a few times - I'm able to sprint far more quickly when I'm asleep than during my waking hours!
I never fail to be amazed by what we're able to do when we're unconscious. Years ago, I lost my hair dryer. It wasn't in its usual place and I couldn't find it anywhere - it made no sense! In the end, I had to give in and buy a new one. Months later, I was putting something in a kitchen cupboard and saw the hair dryer - right at the back on the top shelf of the tallest (ceiling height) cupboard. The only explanation I've ever been able to come up with was that I put it there in my sleep - which would have involved using the step ladder! No recollection of it and I was lucky not to injure myself - I just can't think of any other way the hair dryer would have got there!
When my night terrors/sleep walking are really bad my T says it's because things are 'shifting' psychologically - the sleep disturbance is a way of my psyche trying to release the trauma. So she always says we don't want to try to stop it because it's serving a purpose and telling us something about what's going on internally. But, obviously, it's not good if you are hays icily in danger (falling down stairs etc).
Do you have good 'sleep hygiene'? Eg, do you have a good sleeping environment, a regular routine etc. Have you been able to recognise any factors that seem to pre-empty your night time activity?