Why dementia patients "sundown"

6 years ago

Have you heard of "sundowning"? The term refers to dementia and Alzheimer's patients who seem to get suddenly worse (agitated/anxious/mean/angry/confused) late in the afternoon or in the early evening.

Although doctors do have medicine to treat the symptoms, it hasn't been clear why sundowning occurs. But a recent study might offer some insight.

Researchers found that aged mice who experienced sundowning (like humans) demonstrated changes in parts of their brain associated with attention, emotions and arousal. And mice that were genetically engineered with Alzheimer's had more anxiety before sleep.

The test used two groups of mice. One group was "middle aged" (7 months old) and the other group was "old age" (29 months = a human in his 80s).

The middle-aged mice had three peaks of activity while they were awake. But the aged mice had a flattened rhythm of activity. So when the middle-aged mice slowed down before sleep, the aged mice kept going.

Late in the day, the aged mice put out higher levels of a certain enzyme that causes anxiety and agitation. In addition, the brain researchers saw spikes of two other enzymes (that cause behavioral disturbances) in the brains of the aged mice during sundowning. 

Here's the study:

http://www.medicalnewstoday.com/releases/229757.php

This is an article written by a member of the SheKnows Community. The SheKnows editorial team has not edited, vetted or endorsed the content of this post. Want to join our amazing community and share your own story? Sign up here.
comments

More from living

Living
by Rebecca Waldron | 2 days ago
Living
by Cursha Pierce-Lunderman | 3 days ago
Living
by Fairygodboss | 5 days ago
Living
by Fairygodboss | 10 days ago
Living
by Justina Huddleston | 10 days ago
Living
by Aly Walansky | 11 days ago
Living
by Fairygodboss | 12 days ago
Living
by Justina Huddleston | 15 days ago
Living
by Aly Walansky | 25 days ago