The moon shines on your roof in the evening and a snake suddenly appears! Wait, that's not a snake, it's your arm, sticking out from under the roof.
Your arm is exposed to the moon and the outside and you feel a chill. Where are your clothes? Ah, you're nude, eh (うで)?! I guess it is pretty common to sleep in the nude, eh?
Currently there are no similar looking kanji which exist in the WaniKani learning system