Excessive Somnolence in Elderly Patients with Neurocognitive Disorders
Prevalence and Association with Neurocognitive Disorders
- Up to 70% of men and 56% of women over age 70 experience some form of sleep disturbance, with rates being even higher in those with neurocognitive impairment 1
- Excessive sleepiness in patients with neurocognitive disorders is often multifactorial and bidirectional - sleep disruption can worsen cognitive function, while cognitive impairment can disrupt normal sleep regulation 2
Pathophysiological Mechanisms
- Sleep fragmentation and poor sleep quality at night often lead to compensatory daytime sleeping in elderly patients with neurocognitive disorders 3
- Patients with neurocognitive disorders often have comorbid conditions that contribute to excessive sleepiness, including obstructive sleep apnea (OSA), which is particularly common in elderly populations and may worsen cognitive impairment 3, 1
- Medical conditions like heart failure, diabetes, and hypothyroidism that independently contribute to sleepiness 1
Clinical Significance
- Excessive sleepiness in patients with neurocognitive disorders contributes to decreased quality of life and functional ability 1
- Excessive sleepiness in patients with neurocognitive disorders contributes to increased neurocognitive impairment and accelerated cognitive decline 1, 4
- Preoperative sleep disruption has been shown to predict postoperative delirium, which can worsen cognitive outcomes in elderly patients 4
Assessment Considerations
- The Epworth Sleepiness Scale (ESS) can be useful for documenting daytime drowsiness, though it has not been specifically validated in older persons with cognitive impairment 3
- Input from caregivers is essential when assessing sleep patterns in patients with neurocognitive disorders, as patients may have limited insight into their sleep problems 1