[Whoops, he sure does look confused... she hurries a little to catch up with him and offers him an apologetic smile.]

I'm sorry. I didn't mean to startle you.

[And then her smile becomes more sheepish than apologetic.]

I had a little trouble falling asleep... I thought that I might go for a walk. This city is really amazing, don't you think? There's still so much to see even after the sun goes down...