Sleep tracking - always showing exactly 9:30 in bed since November 22, 2022

Ever since Nov 22nd I've noticed the time in bed shown under sleep tracking is always exactly 9:30, and always the exact same start/end time (9:30pm-7am). Even better, sometimes the time shown sleeping is before or after the time in bed. I've tried rebooting the phone and watch, but hasn't helped at all. Both are on the latest OS version, and the start of it isn't timed to an update on either.

Anyone have any suggestions on what to try next?