The day began at the previous Sleep run whatever became of it, so the memories past DAY_MAX and a failed
night's whole day never met the disposition cover-the-day requires. A night now closes with where its day was
covered through (the ordinal of the last memory it was shown), and the next day is what was admitted after the
newest night that closed 'slept:'; the first night's day is the 24 hours before it opened. A consolidation is
made by a night, whatever room it keeps, so it is not the next day's memory.
Night::from_settings carries the both-or-neither start check out of the binary where a test reaches it.
Tests pin last_sleep with the unit gone, the window's minutes and its 23 and 59 bounds, and the half-set start.
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