It's 5:30 a.m. where I live right now, the forum says it's 9:30 p.m. (go figure) But I work a night job so I'm on at odd times anyways, plus I get on the forum through my phone and post while I'm at work!
I have a messed up schedule so I could be on at anytime, I'm never asleep or awake at the same time.
Which objects drift in depends on what chapter you're on. So if you've slept over 10 times it's safe to assume there isn't any event coming. I've never get anything to appear after 10 nights sleep. Also the endings have event scenes, I'm not sure about the "bad ending" but the "normal" and "good ending" for both Kanata and Rizelea each have a different event scene, so assuming the "bad ending" doesn't have a scene, it'll take a minimum of 5 playthroughs to get all the event scenes. And then there's so many extra slots for events labeled "miscellaneous" and I don't have any of those.