A sleep disorder is characterized by alteration in sleep patterns of a person or animal. Most of them produce disruption in sleep and its functions. This Disruption in sleep is caused by a variety of factors and conditions. We can list out some common sleep Disorders like: Dalayed sleep phase disorder, Parasomnia, Sleepwalking, Sleep apnea, Restless legs syndrome, Night terror, Narcolepsy, Kleine-Levin syndrome, Insomnia, Hypersomnia, Excessive daytime sleepiness, Bruxism, Shift work sleep disorder, Bipolar disorder, Sleep paralysis and Snoring etc. Sleep may be barometer for overall health. There are more than 100 different waking and sleep disorders. They can be grouped into four main categories .i.e. Problems falling and staying asleep (insomnia), Problems staying awake (excessive daytime sleepiness), Problems sticking to a regular sleep schedule (sleep rhythm problem), Unusual behaviors during sleep (sleep-disruptive behaviors). There are treatments for most sleep disorders. Sometimes just having regular sleep habits can help. There may be a bidirectional relationship between sleep and pain in patients with chronic pain. Actigraphy is increasingly being used as a non-invasive and objective method to assess sleep in chronic pain patients. This systematic review aimed to evaluate the utility of actigraphy in chronic pain patients. Additionally, meta-analyses were conducted to compare sleep parameters measured by actigraphy with those measured by sleep diary and polysomnography. Medline (1946-2019), Medline In-Process (May 2019), Embase (1947-2019), Cochrane Central Register of Controlled Trials (1991-2019), Cochrane Database of Systematic Reviews (2005-2019), and PubMed-NOTMedline (1946-2019) were searched for studies using actigraphy to measure sleep in chronic pain patients. Using the random effects model, meta-analyses were conducted to examine the concordance of actigraphy versus sleep diary and actigraphy versus polysomnography for commonly measured sleep parameters. Thirty-four studies with 3,590 patients were included. As an adjunct to sleep diary, actigraphy detected improvements in various sleep parameters after interventions in 10 studies and provided a useful objective sleep metric when comparing pain patients with healthy subjects in four studies; however, diary measurements were more “sensitive”. Comparing sleep diary versus actigraphy, sleep onset latency was significantly lower with actigraphy (mean difference of 22.7 minutes lower; 95% confidence interval: 13.2 to 32.2 minutes lower; p<0.01). No sleep parameters were significantly different between polysomnography and actigraphy; however, the confidence intervals were large. Actigraphy is an objective assessment tool that is being increasingly utilized to measure sleep in chronic pain patients.

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