Sleep
Actigraphy
Actigraphy estimates sleep and wake from wrist motion over many nights—useful for trends, not a replacement for clinical sleep studies.
Actigraphy uses a wrist-worn accelerometer to estimate sleep and wake patterns over days or weeks—cheaper and more natural than a one-night lab study. It tracks total sleep time, fragmentation, and circadian timing trends, though stage accuracy varies by device.
Best used for week-long baselines, not single-night diagnosis.
Common questions
-
Is actigraphy accurate for deep sleep?
Consumer devices approximate stages; they are strong for timing, duration, and fragmentation trends. Suspected apnea or insomnia still needs clinical evaluation.
-
How many nights should you track with actigraphy?
At least seven consecutive nights smooth out one-off stress or alcohol nights and reveal true bedtimes and efficiency patterns.
Related terms
Put Actigraphy into practice
Ohga connects nutrition, fitness, focus, and habits with an AI copilot that learns your patterns. Join the waitlist for early access.