Apple Watch not tracking sleep (sleep tracking is turned on)

I have an Apple Watch series 8, watchOS 9.6.3.

I haven’t turned on my watch in around 2-3 months, but I recently started wearing it again for abt a week. However, it’s not tracking information abt my sleep (screenshots below).

I checked the watch app and sleep tracking is enabled, and I can’t figure out what’s causing the issue. Any recommendations?