Dawn Phenomenon?

In which I speculate based on a single morning's data.

Take a look at my first partial day of continuous heart rate monitoring from my new Microsoft Band 2:

The large heart rate spike is, of course, the run I went on during my lunch break. I started at around 11:45 and finished about forty minutes later. Because I didn't correctly turn on the Band's GPS sensor, it incorrectly logged my five-mile run as a four-mile run and screwed up my pacing. Oh, well. Live and learn. Full run details can be had by viewing the Strava widget on the right hand sidebar of the blog.

But take a look at that spike in my heart rate at about 6:00 AM. My heart rate began rising sometime during the four o'clock hour, peaking durin the six o'clock hour, and then slowly decreasing again. This is precisely what we would expect to see from the Dawn Phenomenon.

If I see this every day, I'm going to have important biometric information about myself. Amazing.