The app says 7 hours 32 minutes. Deep sleep: 1h 14m. REM: 1h 47m. Sleep score: 82. I woke up feeling like I hadn't slept at all and the first thing I did was check the numbers to find out if I was right. The numbers said I was wrong. I lay there holding that for a while - the disagreement between what the data said and what my body was saying - and eventually got up anyway, because the data was supposed to win.

I've been doing this for two years. Every morning the same ritual: check the score before I decide how I feel. I've noticed I feel worse on the mornings I look first. Something about seeing an 82 when I feel like a 40 creates a conflict the body loses. I spend the rest of the morning trying to reconcile the two versions. The score says I recovered. The tiredness says I didn't. I trust the score more than I trust myself, which means I spend all day slightly confused about whether I'm actually tired or just failing to interpret my own data correctly.

My body has been speaking to me for thirty-one years. I've been tracking it for two and already I trust the tracker more.

Last Tuesday the app glitched and didn't record anything. I woke up fine - genuinely fine, rested, present - and realized halfway through the morning that I had no score to compare it to. I'd just woken up and felt how I felt without any interference. I don't know what to do with that. The app is back now. I check it every morning. Do you know what your body is telling you before you check what the device says?