Additionally, sickness, including common cold, can lengthen sleep enough to make it unreasonable to get to work early, and forcing (mildly) sick people to early work getting them further sick is an accepted practice.

Or running civic services 7 AM - 3 PM which makes it impossible to schedule without a free day or understanding boss. Something that should be available with perhaps only a minor downtime works only for a few hours.

The cumulated morning/evening hours tend to overload transportation facilities too.