Rule 437: Students beds are to remain in their dormitories.
"Student out of bed! Wandering the halls!"
"Yes, yes, I can see that Filch, calm down please. I will take care of this."
*sigh*
"Miss. Magdelin, do I even want to know what you are doing?"
"Well, I'm taken a tour 'round da castle see? I never 'ave any time outside o' class an' homework to really explore an' I realized tha' after hours is a great time ta do tha'! But then there's da rule 'bout not being out o' bed after 10 (which is silly cuz' all da' older students are always up and about in da' common rooms) so I was thinkin' tha I just needs ta take me bed with me!"
"What."
"Well, I'm not out o' bed now am I?"