Variations in circadian rhythms of activity, sleep, and light exposure related to dementia in nursing-home patients.

Nursing-home patients with severe dementia exhibited lower activity levels and less exposure to bright light compared to those with moderate, mild, or no dementia.

• Severely demented patients displayed more fragmented sleep patterns, sleeping more during both the night and day.
• No significant differences were found in the number of awakenings at night or daytime naps between the two groups.
• Circadian activity patterns in severely demented patients were characterized by a lower activity level, reduced amplitude of activity, and later peak activity times.
• Less time spent exposed to bright light was noted in severely demented patients.
• The findings suggest that disturbances in circadian rhythms are more prominent in patients with severe dementia and may be linked to mental status rather than age alone.

AI simplified