Same experience for me. If I wake up but lie still it's not nearly as accurate. What I do find useful is the Body Battery score, that generally maps well to how

Same experience for me. If I wake up but lie still it's not nearly as accurate. What I do find useful is the Body Battery score, that generally maps well to how I feel the next day. And the Stress Score is an eerily good indicator of when I'm getting sick and when the illness is stopping.