Home / Tools / Night Sky Sleep Diary / Watch sleep data
Sleep diary · watches and rings
Your watch already tracks your sleep. Put it to work.
The Night Sky Sleep Diary can fill in your nights from the file your watch or ring app exports. You check each night, change what does not match how it felt, and then use the diary's CBT-I steps: sleep window, bed rules, calmer sleep thoughts and a wind-down.
Pick your watch or ring
How it works
- Export. Ask your health app for your data file (steps on each page below).
- Choose the file. Open the sleep diary, tap From my watch or phone, then Choose file.
- Check each night. The diary shows bedtime, time to fall asleep, time awake and wake-up for each night. Untick or fix anything that is off, then add.
🔒 Your file stays with you
The file is read inside your browser, on your own device. It is never uploaded to WhySigh or anyone else. The nights you add are saved in your browser, and if you sign in, as an encrypted copy only you can read.
🧭 Why you still check each night
Studies that compare watches and rings with sleep-lab tests find they estimate total sleep fairly well but are least accurate at telling when you are awake. And chasing better tracker numbers can itself make sleep worse; sleep researchers call it “orthosomnia”. A sleep diary for insomnia is about the night as you lived it, so the imported times are a starting point you confirm.
Sources: Kainec KA, Caccavaro J, Barnes M, et al. Evaluating accuracy in five commercial sleep-tracking devices compared to research-grade actigraphy and polysomnography. Sensors. 2024;24(2):635. → · Baron KG, Abbott S, Jao N, Manalo N, Mullen R. Orthosomnia: are some patients taking the quantified self too far? J Clin Sleep Med. 2017;13(2):351–354. →
Common questions
Is my health data uploaded anywhere?
No. The file is read inside your browser on your own device. Nothing is sent to WhySigh or anyone else.
Does it cost anything?
No. The sleep diary and the import are free, with no ads and no sign-up.
Can a watch diagnose insomnia or sleep apnea?
No. A watch can help you notice patterns, but only a clinician can diagnose a sleep problem. Loud snoring, gasping at night or heavy daytime sleepiness are reasons to see a doctor.