It is also sort of implied that other species in the Federation also come from planets with an approximate 24 hour cycle, which is unrealistic. It would have been nice if there was perhaps a mention of some crewman from 'whatever world' who has an unusual shift pattern because his homeworld's day is shorter and he needs to sleep shorter but more often, or another species who can work a couple of days straight, but is then out cold for a whole day.
Unless Federation medical science can align all crewmembers day-night cycles to an earth standard 24 hours
Would part of the Academy regimen be to habituate plebes of other races from the get go, to adjust to the rhythms and cadences of biology as lived by the agreed upon "gatekeeper' culture? I'm not suggesting medical interventions to overcome physiological conflicts, but haven't medical residents had to deal with such assaults on their cycles for a very, very long time?