The actigraphy is a test that allows estimation objective of the usual duration of the dream . It can be a very useful tool for estimating sleep patterns and sleep duration in healthy adults. Although not necessary in all cases, it can be especially helpful when patients cannot reliably complete a sleep record or there are questions about the validity of the information provided.
Characteristics of this test
Actigraphy records movements through an accelerometersensitive, typically worn on the wrist, and estimates sleep parameters using a computerized algorithm. Actigraphy is well validated against the objective sleep times obtained from polysomnography (PSG) and provides useful estimates of total sleep time, the amount of awakening after sleep onset, and the percentage of sleep. Actigraphy is typically used for a duration of one to two weeks. Some actigraphy devices also include light sensors, which can help quantify patients’ light exposure at night or in the morning and verify bedtime. These data may help identify patients with circadian sleep-wake rhythm disorders influenced by inadequate light exposure.
Indications for performing an actigraphy
The doctor may recommend if the patient suspects: The original indications for conducting a polysomnographic / polygraphic study according to the Clinical Practice Guideline are:
- Excessive daytime sleepiness not related to chronic sleep deprivation. For the diagnosis of excessive hypersomnia, a multiple sleep latency test (TLMS) may be necessary.
- Alteration of the respiratory pattern during sleep.
- Violent motor activity related to sleep.
- Disorder from periodic movements of the extremities during sleep.
Actigraphy is a painless, non-invasive test. It has no complications or side effect.
