Apple Watch 6 wake me in the middle of the night

Ever since the last two Apple Watch updates (I am now on 8.3) my watch keeps waking me up in the middle of the night to stand up. So my sleep schedule is no longer working correctly. My sleep has been interrupted by this every night. It puts itself in sleep mode just fine or I do it manually if I go to bed early, but then at 2:30am or so it will beep and tell me it is time to stand up. I can then put it back into sleep mode and sometimes it will stay that way until my 7am alarm and other nights it tells me to stand up again around 4:30am. Then I can put it back in sleep mode again and it will stay that way until my 7am alarm. Please help! I need my sleep.