Why Row for One Hour?

The reason I've chosen one hour as the daily session recently is because I've discovered that one hour of aerobic activity daily seems to be optimal for getting a good night's sleep.  More than an hour is okay but less than an hour tends to correlate with poorer sleep. 

There was a glitch in RowPro's recording of today's data which resulted in it combining all of the last 14 splits into one split, the seventh.  Also - it erroneously shows ending heart rate for the session as zero.