It wasn't Kaladin's fault he was afraid of heights.
Renarin was already lying on the bottom bunk of the other bed. Shallan insisted that she sleep walked and would fall off the top bunk. That left two top bunks, which Kaladin inspected critically by the light of the spheres.
"I'll sleep on the floor," he said.
"Have you seen that floor?" Shallan asked, raising her eyebrow. "It hasn't been cleaned since the carpenters finished building it."
"It's not that bad," Kaladin said. He scuffed it with the toe of his boot and pretended not to see the line that left in the dust. "I'll be fine."
"Why not... sleep on the bed?" she suggested. "I know it's a groundbreaking idea."
"No thanks," Kaladin said. He heaved the mattress off the bed and onto the floor. "It's only for a night, anyway."
"I used to be that suspicious of new inventions as well," Shallan said. "It took time, but soon I was able to sleep on a mattress instead of the ground."
"Decent?" Adolin asked, knocking outside. He entered the room, carrying two backpacks and an armful of blankets. He threw most of these on the top bunk above his brother.
"You're meant to wait for an answer," Renarin said.
"Not if he meant morally decent," said Shallan.
"Kaladin, there is another bed," Adolin said. He clambered up onto his bunk and began tucking the blankets in. He didn't seem to be able to sleep without three or four. "You don't have to take the floor."
"I want to take the floor," Kaladin said. He stretched out on it. "See? Fine. Cosy."
"It looks mostly dusty," said Adolin. "Gross and dusty."
"It's fine," said Kaladin, who spoiled his argument by sneezing.
"...Kaladin, why don't you like bunks?" Shallan asked finally. Kaladin sighed.
"I fell off one when I was little," he said, very quietly. "I broke my wrist. I thought I wouldn't be able to become a surgeon."
"But now, stormlight," said Adolin. "Even if you did fall off one, you'd be able to-"
"I know! I know. But still," he said, "I'd prefer the floor."
"Fair enough," said Shallan. She stood and heaved her mattress off her bunk.
"What-" said Adolin.
"Have you seen these beds?" Shallan said, pushing the side of it. The whole structure swayed and creaked. "We'd all be better off on the floor."
"You don't need to do that," Kaladin said tiredly.
"I had enough of bunks on the voyage to the Shattered Plains," Shallan said. "Narrow, uncomfortable, creaking all night..."
"Have I mentioned that I'm a prince?" Adolin asked. He hopped from his perch and also pulled his mattress down. "I don't actually know how to sleep on a bunk."
"You-" began Kaladin.
"We're too rich, that's the problem," Adolin continued. He and Shallan pushed the mattresses together until the floorboards between the bunks were invisible. "I can't handle these peculiar structures. I need something with four posts and a curtain."
"Or the floor," Shallan said.
"I suppose I could sleep on the floor. It must be more comfortable than those strange contraptions." Adolin shrugged. He flopped on the mattresses. "These will be far more comfortable."
"You're ridiculous," Kaladin said.
Renarin was inspecting the space available on the floor.
"You might all need to squish up," he said eventually. "There's not enough space for another mattress down there."
"You're all ridiculous."
"Don't be ridiculous." Shallan said.
"We're not ridiculous, we're comfortable," said Adolin.
"Fine." Kaladin's over-exaggerated sigh couldn't quite hide a tiny smile. "Well, if you're all determined to be ridiculous-"
"More determined than I've ever been about anything in my life," Shallan said.
"If you're all determined to be ridiculous, we should all prepare for bed," Kaladin continued. "Early start tomorrow."
"I hope none of you snore," Adolin said as an afterthought.