I usually have very high body battery ratings in the morning when I wake up between 7-8am (90-100, my sleep score on average is at about 80-85) but often reach 10-15 towards the end of the day, if I had a stressful day or doing an cycling activity in the evening sometimes it ranges from 5-10. What I realised when looking at the body battery scores is that even though I have rather average stress in the morning my body battery is at 50-60 at 12 when having lunch. It seems like the decrease is rather exponential in the morning until 12 and then to some degree flattens towards the evening (I am losing less points from 12-20). Towards the night the decrease seems to slow down, the last points seems harder to decrease than the first points.
Do you see similar trends for your curves?
Cheers
Michael