That ended up being quite a big nap! I'm pleased to say I've been up again, managed to get myself breakfast and a coffee and sit up by the kitchen counter for an hour. Now back on the sofa bed with my feet up and I may well nod off again.
I feel much more stable on my feet than last time. A lot of the stiffness in my back which I hadn't even realised was there has gone. I couldn't reach behind me to close a door behind me last time around but I can do it today. I also struggled with any obstacle - a pair of shoes left lying in my way terrified me - but I can step over things this time. I'm more confident using the sticks too. I think I've built up extra muscle in my arms and I feel happier letting them take the weight.
I'm also pleased to report that my usual black coffee and familiar surroundings has solved any lingering problems without having to resort to the stool softener!