Tuesday, August 27, 2019
We have all had that after lunch afternoon slump where we just want a nap. Do you find yourself napping more than usual? There is a new study on changes to sleep-wake cycles and Alzheimer's. For the non-scientist like me, here's the USA Today story: Napping more? That could be an early symptom of Alzheimer's, new study says.
So wait, don't panic if you are a normal napper. Here's a segment from the article that explains: "People who develop Alzheimer's tend to sleep more during the day, taking naps or feeling drowsy and dosing off. Sometimes, they wake up during the night; that's called fragmented sleep .... If napping is a part of your routine on a regular basis though, you don't need to worry about taking an afternoon snooze, or mid-morning for that matter." So it's all about the change in sleep patterns. Whew.
Here's the abstract for the article about the study.
Sleep-wake disturbances are a common and early feature in Alzheimer's disease (AD). The impact of early tau pathology in wake-promoting neurons (WPNs) remains unclear.
We performed stereology in postmortem brains from AD individuals and healthy controls to identify quantitative differences in morphological metrics in WPNs. Progressive supranuclear palsy (PSP) and corticobasal degeneration were included as disease-specific controls.
The three nuclei studied accumulate considerable amounts of tau inclusions and showed a decrease in neurotransmitter-synthetizing neurons in AD, PSP, and corticobasal degeneration. However, substantial neuronal loss was exclusively found in AD.
WPNs are extremely vulnerable to AD but not to 4 repeat tauopathies. Considering that WPNs are involved early in AD, such degeneration should be included in the models explaining sleep-wake disturbances in AD and considered when designing a clinical intervention. Sparing of WPNs in PSP, a condition featuring hyperinsomnia, suggest that interventions to suppress the arousal system may benefit patients with PSP.
The full study is available here.