Other times, especially when I find myself connecting with a character, I'll slow down and reread everything and sleep whenever I think a reasonable person would need sleep. Which is to say, I think the average person would need rest a lot. Imagine, for instance, if you got into a fight today. And then another fight. And then another fight. With people dying each time. I think you would probably feel worn out pretty fast.
Sure, but on the other hand, 5e adventurers aren't "reasonable persons", if you're using "person" to mean people in our real world. D&D adventurers are exceptional beings who can use magic, naturally heal all wounds simply by resting, channel Ki, instantly go from near-dying to practically fully fighting fit, and in general do all sorts of extraordinary things.
Me? Yeah, sure. 1 fight to the death would probably make me need to sleep for at least a night, if not get urgent extreme medical attention and/or have died. But I'm basically a commoner.
Also, there could be a mechanic for this: exhaustion. Larian could decide on some triggers that cause characters to get a level of exhaustion (e.g., every X combats, going down in a fight, using X spells or abilities, entering X new area). This would be a neat, simple way of communicating to the player that their charactrer and Companions are getting tired from all the fighting & exploring. Then you, the player, gets a roleplaying choice: do you decide that your Tav would want to push through the exhaustion because they feel time limited? Or is your Tav satisfied with their progress that day, and so turns in for the night? [to be clear, in this system I'd suggest that a single LR cures all levels of exhaustion]
