Recently, I got curious again: I was still tracking all the sleep data, but wasn’t doing anything with it. I’d gotten bored, complacent, and so the data piled up without much to say for itself. Today, in a fit of rainy day pliability, I tediously copied data into an excel sheet. This was my first gripe: Pebble doesn’t allow csv exports (but then again, hey, they don’t exist anymore). SleepNumber doesn’t allow data exports (they once did, but “retired” the feature because reasons), and their customer service reps are pretty tight lipped on why I can’t access my own data, yet their TOS says they’re allowed to sell it. Only SleepCycle lets you export and study your own data, so thumbs up to them.
SleepCycle and SleepNumber both track total sleep time, and assess a 1–100 score for the night, based on “who-knows-what-exactly”. Pebble only assesses total sleep time, no score. So I built a couple graphs using the past few months of data. The results were dreadful.
Matthews’ comparison is by no means scientific but, then again, neither are the numbers these apps and devices are spitting out: I have noticed no correlation between Sleep Cycle’s “sleep quality” value and how rested I feel when I wake up.