I see it as, you take what you can get. Especially with D&D, if we're going off the lowest common denominator to justify tossing out realism for everything else, then adventures might as well take place in wibbly-wobbly timey-wimey swirls of chaos where your armor can just as easily turn into a pink elephant and squash you*, because D&D is already a raging uncontrolled mess to anyone with regard for historical or physical accuracy. Accurate combat is always going to be a challenge, but pretty much everyone understands that it's hard to sleep well when you're extremely uncomfortable. We can make it feel more real for very little downside, so why not?
Not sleeping in armor doesn't mean not fighting in armor, for the most part (unless your DM is sadistic but that's really its own problem), so I guess I'm confused as to why this is where we draw a line in the sand? Sure, martials have it bad in D&D, but for that discussion I have much bigger bones to pick than what they wear to bed.
*I'm sure this has happened at a table somewhere.
It's just a weird penalty for a build option that is already penalized in multiple ways. In my own experiences sleeping while uncomfortable I slept just fine, especially if I was physically exhausted. Of all the things to change or limit because of realism, on a scale of 1-10, this barely ranks a 1. Based on what others that actually have experience, it doesn't even rank that. From a gameplay point of view it can be a major penalty, one that can be completely avoided by building a dex based character.
If you have personal experience or have talked to people who have that say that it can't happen please share. Because after a minute or so of googling I found this (1):
I did. I worn plate armor for the croydon parade which ended in a festival. After dueling most of the day i was shattered and could not be bothered getting out of the armor and fell asleep in my tent. Okay i did not wear a helmet when sleeping but the gambeson kept me warm at night. If it was chainmail the weight on my chest would have been uncomfortable but i wore full plate and when lying on the ground it supports itself.
EDIT: just a note - if you scroll down on the link I got the post from, there's an image from a medieval manuscript of someone sleeping in armor.EDIT #2: another first-hand testimonial (2)
I've slept in both chain and plate with no problem; it's actually pretty comfy so long as you aren't expecting a feather bed. After a hard day wearing armour (let alone travel and fighting in it), mostly all you care about is being warm and having a bit of quiet so you can get some shut-eye. The thing about armour is that on the whole, it's the same shape as you. That means you can really snuggle into the nooks and crannies and if you're on even something vaguely soft it's not really that much less comfy than not wearing it. The main issue is any pointy bits, but you can tuck blankets around you or, you know, just sleep so the pointy bits aren't poking you. I have issue with rules that imply there should be any penalty for wearing even the heaviest armour (unless they're stupid fantasy armour, of course; that stuff might be a different matter).
tl;dr - if armour wasn't comfy to sleep in, it wouldn't be wearable in the first place.
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