I've slept in fairly uncomfortable positions before, so it isn't a deal breaker so much as an inconvenience.

[He likes privacy and comfort, and he was admittedly spoiled during his time under Shido...

Not that he'd ever want to go back.]

A.B.A-san is incredibly large, but the tunnels are at least spacious enough that it hasn't caused many problems yet. If your rooms are all equal in size, I can't imagine it's convenient for those larger in stature...

[Perrin comes to mind, because he certainly isn't in Oran.]