This biodynamic lighting setup could easily be used as a non-pharmacological intervention in a home situation. They also were more likely to report fatigue, wake up confused during the night, and have excessive sleepiness and impaired functioning during the day. This pilot study found promising evidence (effect sizes >0.5) that biodynamic lighting, tailored to stimulate circadian entrainment, could be helpful in decreasing sleeping disturbances in patients with dementia. Findings showed that those who had light exposure while sleeping got about 10 minutes less sleep per night. The average total time out of bed at night significantly decreased from 180 to 104 min (P = 0.006). The average total night-time sleep significantly increased from 408 to 495 min (P = 0.007). There is evidence that light exposure during daytime activates the autonomic nervous system, which controls your bodys involuntary activities. The average frequency of daytime napping significantly decreased from 16 to 7 times (P = 0.004). During exposure the average frequency of night-time bed wandering significantly decreased from 11 to 5 times (P = 0.002). The indoor temperature of the soundproof, dark room was 25 1C, and the humidity was 50 5. The white light stimulation and dark state were used in the control group. Objective data of the sleeping pattern were collected using a bed sensor. In order to describe a general sleep environment, we set the dark state that turned on the support lightning lamp which helps the sleep. These periods were intermittent in an AB-phase design. Three biodynamic lighting armatures designed for home use were placed in the common area for a period of three weeks and then removed for the same period. In this study, we evaluate the exposure to biodynamic lighting on circadian functioning of 13 patients with dementia admitted to a psychiatric hospital. The effect of biodynamic lighting with varying intensity and colour resembling a daylight curve has hardly been objectively researched. Sleep disturbances form a high burden for informal caregivers and is the main reason for institutionalization. The use of blue light-emitting electronic devices in the hours right before sleep can negatively impact overall health, alertness, and the circadian clock. And their biological clock is often not enough stimulated by light. Dementia can disturb the circadian rhythm more than in normal ageing people.