Is there a way to track sleep in either the free or pro version?
No. There is a fatigue thing but no sleep tracker. You could write it in your notes. I think most people use some sort of activity tracker like a fitbit or garmin or something to track sleep
I deal with migraine so use migraine buddy. It has a sleep tracker on it.
Under armor has a free app called record that I used before my Fitbit. It's pretty good also the sense me app has a sleep section. Also free
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