Figure 1.

Actogram obtained by actigraphy over a 7 day period from an older adult patient with ISWRD. The yellow bars indicate timing and level of ambient light exposure and the black bars indicate activity levels recorded at the non-dominant wrist. Note the lack of a discernible circadian sleep and wake rhythm. Sleep is characterized by nocturnal fragmentation and multiple short periods of sleep and wake across the entire 24 hour day.