I am trying to make a graph of my heart BPM while sleeping. I created the data using a Bluetooth chest strap and an Android app called MyWorkouts.
There are two columns of data – a timestamp and my [mostly] sleeping heart rate. I want to make a graph of BPM against time on the Y-axis.
I managed to graph the heart rate but don’t know what to do with the timestamp column (to format it with actual times on the Y-axis).
Any help appreciated. File is attached.