Actigram from a patient with irregular sleep-wake rhythm disorder

(A) 72-hour actigram in a patient with dementia showing a relatively well perceived sleep-wake pattern. Although sleep is fragmented, there are distinct day-night differences.
(B) 72-hour actigram in another patient with dementia showing severe sleep fragmentation, consistent with irregular sleep-wake rhythm disorder. There are no long intervals of consolidated sleep or consolidated wake.
Note that these are double plots, so that the data from midnight-to-midnight at the end of day one are repeated at the beginning of day two, etc. The activity data have been scored for wake (thin line under the activity data) or sleep (thick line under the activity data).