Wei Wuxian does doze off since the pool area is pretty quiet overall and Lan Wangji can't make any noise. So he's oddly content to enjoy the silence. Exploring is too much work when you can't see anything and there is only so much he can say that can be easy for Lan Wangji to answer.

"mm..if I sleep Lan Zhan..don't let me sleep too long.." He knows he shouldn't sleep in strange places and it's not the same as laying out under the stars on someone's roof.