People generally appreciate that sleep is important, and so one shouldn't make a lot of noise in residential areas late at night. That's great. What bothers me is that people often treat the mornings rather differently. Scheduling maintenance work on campus housing for 7:45am somehow doesn't strike the university as grossly inconsiderate, the way that scheduling it for 11pm surely would. Of course, one can imagine circumstances in which this would be perfectly reasonable, i.e. if one had a reasonable expectation that everyone would ordinarily be awake at that time anyhow. But we're talking about graduate student housing here, and it should be common knowledge that there's a fair bit of variation in the sleep schedules of graduate students. Many find that they work better at night, and so don't ordinarily wake up until fairly late in the morning.
Early-risers (or administrators with traditional working hours) often seem not to understand this. Perhaps they think that any grad student who's still asleep at 8am is just "sleeping in", the way that they themselves might do on a lazy weekend. I don't think that would be an adequate justification anyhow -- interrupting a pleasant sleep-in is bad enough -- but of course the actual situation for those of us with later sleep schedules is rather different. We're talking about interrupting one's normal sleep schedule. It is less like interrupting the early-riser's weekend sleep-in, and more like waking them up at 5am, or whenever qualifies as a couple of hours before their usual waking time. (Or perhaps like keeping them up at night for a couple of hours past their usual bedtime.) It's really quite unpleasant.
Perhaps the inconsistent treatment is thought to be justified by early-riser moralizing: really (the thought goes), people ought to wake early. Those on later sleep schedules must just be lazy, indolent, etc., and so have no right to a full night's sleep. Hell, it'd be good for them to get up earlier, so what are they complaining about?
But this argument seems doubly dubious. First, I'm not sure what the empirical basis is for thinking that everyone would flourish best with a larkish sleep schedule. This neglects the full scope of human cognitive diversity. Secondly, the attempted justification seems objectionably paternalistic. Even if someone would do better to change their sleep schedule, surely that's their business, and others ought to respect their wishes (including their actual sleep schedule) so far as possible. And on a more practical note: interrupting their sleep this once (or however often the apartment requires maintenance work) doesn't seem likely to have any long-term effect. It'll just make them tired and grumpy for the rest of the day. And that's really not a very nice thing to do to someone.