
Afraid of the dark? How strange, but not uncommon among humans. Yesterday himself had four modes; day vision, night vision, heat vision and radiation. He could switch between the three at will, but he knew human night vision was limited and culturally, according to the books he read, they'd been long afraid of night and thought of it as a scary and mystical thing.
"I can walk you back to your home, if you'd like." That way he'd be safe and sound, and he wouldn't need to wander in the dark alone. As for Yesterday, his night vision made the dark a regular thing and he could wander the streets as he pleased. In fact, he always did; he had no home or station to go to.