With actigraphy, your circadian rhythm is examined—that is, the times when you sleep, when you are awake and active, and how regular your rhythm is. Actigraphy also provides information on how long you spend in bed and how restful your sleep periods are. However, actigraphy cannot measure actual sleep stages. During the examination, you may live according to your usual daily rhythm.
Movement activity examination, actigraphy
Actigraphy is used to examine circadian rhythm.
No prior preparation is needed for an actigraphy examination.
Actigraphy measures movement activity over several days. The typical duration of the examination is two weeks. The actigraph is a small wristwatch-like device that measures movement using a sensitive accelerometer. The device is attached to your wrist with a strap.
The actigraph must be removed during showering or sauna, but otherwise it should be worn continuously throughout the examination, both day and night. It does not need to be removed for regular handwashing. The device is also not resistant to strong impacts.
There is a button on the actigraph that you press when going to sleep and when waking up, as well as when you remove the device from your wrist and when you put it back on. You will also receive a sleep-wake diary, in which you record the same events. Carefully filling out the diary is important for the success of the examination.
The actigraphy examination does not require follow-up and does not impose any restrictions on normal life.
The doctor who referred you for the examination will inform you of the results and how treatment will proceed. Contact your care unit if you do not have a scheduled appointment or call time.
The actigraphy examination is painless and involves no risks.
Updated 14.11.2025