[angiolillo]

I find Garmin's sleep tracking "accurate" in that it typically matches how I feel the next day, but that also makes it not terribly useful because I don't really need a gadget to tell me when I feel tired. Mostly I wear the watch to sleep out of inertia and in case I need a flashlight in the middle of the night.

But there have been three aspects of sleep tracking that have been mildly useful:

1. A few times my heart rate variability went haywire and the sleep scores didn't match how I felt, and it turned out I was sick and had not yet noticed any symptoms. Since then it has been mildly useful to have a heads up when I'm probably coming down with something before symptoms show up.

2. You can use their Lifestyle Logging to track how things like caffeine, alcohol, and various nighttime routines affect your sleep. I mean, I haven't discovered anything that's not already common knowledge, but somehow having hard data makes it more compelling. I suppose if I was going to trial any sleep aids then Garmin's correlation would be convenient and save me from having to maintain my own spreadsheet.

3. It alters the suggested workouts if you haven't been sleeping well. Trivial to do manually, but it's a convenient reminder not to overextend.