Ok. So he's curious and he can't sleep. He wants to know. What's his need from you? Has he requested anything from you? Like letting him watch? Or telling him about it?
Or is this post about how YOU feel about his wakefulness/curiosity? And being ok feeling whatever it is you feel about that,
and not taking any action to DO anything about it to meet his need? More about meeting your own?
I'm not clear if this is a "I feel X. I need tips on how to weather it out and let emotional weather blow on thru..."
or if this is a "My DH asked me X. I don't know how to respond to his request."
Could you please clarify?