The slow speed chase in TLJ takes place over 18 hours. The events in Crait probably took four hours minimum. There is no telling how long the initial evacuation took or how long the characters were awake prior to the attack.

From these, I estimate that the characters would have had to be awake for a minimum of 28 hours. There are certain characters who could not possibly have taken a nap, like Finn and Rose since hyperspace travel is instantaneous now.

Since standard days in the Star Wars universe are about the same as in Earth, it is reasonable to assume that the characters on both sides should have been utterly exhausted by the end of the movie due to fatigue from staying awake and from adrenaline wearing off repeatedly throughout the day.

Aside from Leia looking tired, no other character shows any hint of exhaustion during the movie. Maybe they have better energy drinks than we do or maybe it was a bad idea having such a...suspenseful... series of events all taking place during a single day.