I've been accumulating pictures of the midshipman's berth over the last while (as you do) and now I'm going to spam you with them :) I love these illustrations, the details are always fascinating and there's always at least one mid getting up to mischief! This one, The Interior of a Midshipman's Birth dates to 1821 and is by George Humphrey. I love the guy who appears to be drawing on his sleeping messmate and the chap putting his overcoat on, I wonder if he's going on watch?
National Maritime Museum catalogue record
here.