Stand Reminder Schedule Waking Me Up While Sleeping

So, on my previous watch (2nd gen), the Stand Reminder worked from 8am-8pm. It was even blocked out in the Activities app. Last night, my new watch wanted me to stand up every 50 minutes from midnight to 6 am....

I do NOT want to turn off stand reminders as I do want them during reasonable hours but I can't figure out how to schedule them. Neither can the few Apple Advisors I spoke to.

Again, I do not want to turn them off unless there is no way to get it to only work during my work hours...

Thanks for any help!