Sounds as though it'd be useful to me, then.

[Because staying alert when you're plagued by nightmares, need to focus on healing, writing notes, or just plain don't want to sleep because shadows are spooky is something Carlisle can definitely relate to.]

I'll have to try some sometime, if you don't mind. I suppose it'd give me an excuse to get out of the house.

[Which he clearly doesn't do very often.]