Who? Older Bill and Older Zu Where? Little Asgard When? Monday Morning What? being awake. Open? Yes, to people they live with.
Bill hadn't slept much since he'd arrived in the past, too busy re-learning things like how his then-home sounded at night and how the animals had reacted to him back then and all sorts. He'd be writing things down, thoughts and impressions and a couple of story ideas (pen and notepad, not noisy typewriter) and the clock would suddenly jump from eleven thirty at night to four in the morning, and he'd have to force himself to even get three hours sleep after that. Last night, he'd managed to be asleep just before midnight, but then he was awake at half-past four anyway. After a couple more hours of writing, he'd given up and gotten dressed before heading to the kitchen for coffee.
Once he had his mug of coffee in hand, he then looked through the cupboards and fridge to see what else he could scrounge up. Nothing really took his fancy, so he decided to go wake Zu instead. Obviously, he was nice about it, and brought her her usual breakfast drink. He was a good not-quite-brother, really.
Once he was at her door, he even knocked on it once, before walking in and going over to sit on her bed. "Wake up, young Zu," he said, grinning as he borrowed his adopted grandfather's manner of speaking, "or this day will merely happen around you, instead of you having an impact on it. Could you imagine how intolerable that would be?"