For me, data means a source of self-understanding and a boost for better performance. In some previous articles, I have described how I track stress, how I changed my life with a simple excel spreadsheet or how you could live healthier with the help of technology.I have been tracking my sleep for years to be able to optimize it. So, I have quite an experience with apps, sensors, and methods. I even had a six-month-long sleep tracking experiment to get the most out of my sleep. I have tried many sensors ranging from Fitbit One and Surge to Viatom Checkme and Withings Pulse, but for me, the ultimate solution turned out to be the Pebble Time sensor and Android for Sleep app duo. This jackpot combination has been my companion for two years already. The app is the primary source of algorithms. It measures detailed sleep quality, while the sensor is measuring my movements, and wakes me up at the best time in the morning.As I often talk about how I track my sleep, I received the question after my keynote in Lisbon what I think about the freedom of choice regarding sleeping and waking up with a tracker. The questioner said that if he used the devices that I use, he would give up his freedom since technology would have a control over his life.

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