Apple Watch Ultra 2 and iPhone 16 enter Sleep Focus after workout

Ultra 2 watch paired to iPhone 16 both running latest OS enter sleep focus (nor mode) after workout.

Start outdoor biking work out

Both faithfully record all relevant data position, elevation. cadence, speed, heart rate, distance, effort, and heart rate zones during the 2.5 hour ride.

Come back cool down heart rate drops to 60 bpm or less. Watch and iPhone now have entered sleep focus

leaving sleep focus requires many times to leave sleep focus in the control panel (sleep focus off then back on)

I have searched Apple support and other sites but have not found a solution (or any one else with the problem)

Just a minor irritation.