That sounds like a really wise step to take, those middle-of-the-night walks can be so unpredictable. A home assessment could make a big difference, especially in an older house. An occupational therapist would be a great place to start, as they can suggest simple things like rails, gates, or lighting that actually fit your routine. Even small changes can give you a lot more confidence and peace of mind.
You might also find this discussion helpful from the same forum; people share real experiences around falls and safety at home: protecting myself from falls