Apple Watch update notification waking me up

I have a smart watch specifically so I don't miss messages from work at night so I have to wear it while sleeping. Last night, for the umpteenth time, my watch decided to send me a message at 3AM that an update was available. I'm guessing it's timed to when I last charged it as I had to charge it before I went to bed -- is it possible to change this? I have a hard time falling back to sleep after these because my brain is wired to think it's a work emergency.