Sleep Tracker: Circadian
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The Sleep Tracker: Circadian blog.

Straightforward answers, practical walkthroughs, and a closer look at the jobs the app can help with.

sleep diary with Apple Health

How to Keep a Sleep Diary With Apple Health Data

Add daily habit notes to Apple Health sleep stages and build a sleep diary that is useful without becoming a chore.

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Apple Health sleep stages meaning

Apple Health Sleep Stages: What the Data Can Tell You

Understand Awake, REM, Core, and Deep sleep in Apple Health, plus the limits of consumer sleep-stage estimates.

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sleep tracker data changes every night

Why Sleep Tracker Data Changes From Night to Night

Learn why sleep duration and stages vary, how to review inconsistent data, and when a missing night may be a recording issue.

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habits to track for better sleep

8 Habits Worth Tracking Alongside Your Sleep

Choose a manageable set of daytime and evening habits to record with sleep data, without turning the diary into a second job.

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