Justification not yet generated — showing supporting facts

• A transition from short sleep duration (SSD) to long sleep duration (LSD) was associated with lower global cognition scores, including on episodic memory, figure drawing, and TICS tests.
• A history of stroke was reported by 2.7% of the less than 6 hours sleep group, 1.7% of the 6-8 hours group, and 2.2% of the greater than 8 hours group, with an overall prevalence of 2.1%.
• In the study using the CHARLS database, the standard sleep duration group exhibited optimal cognitive scores, episodic memory, and mental intactness, while both short and long sleep durations were significantly associated with cognitive decline, with long sleep having a more pronounced negative effect.
• Sleep duration was categorized into three groups: Short Sleep Duration (SSD) as <6 hours, Medium Sleep Duration (MSD) as 6-8 hours, and Long Sleep Duration (LSD) as >8 hours.
• For subjects with Short Sleep Duration (SSD) in Wave 1, the study classifies change patterns as: 'Excessive' (if there was one wave with Long Sleep Duration), 'No change' (maintained SSD in two waves), 'Benefit 1' (maintained SSD in one wave and had Moderate Sleep Duration in another), and 'Benefit 2' (Moderate Sleep Duration in two waves).
• Short or long sleep duration can disrupt the circadian rhythm.
• Short or long sleep duration and the disruption of the circadian rhythm are risk factors for neurodegenerative diseases, including dementia.
• The mean Body Mass Index (BMI) of all participants was 23.4 (standard deviation 3.7), with the less than 6 hours sleep group at 23.0, the 6-8 hours group at 23.6, and the greater than 8 hours group at 23.2.
• A meta-analysis revealed an inverted-U-shaped association between sleep duration and the risk of Alzheimer’s disease, where both short sleep duration (SSD) and long sleep duration (LSD) are associated with a higher risk compared to moderate sleep duration (MSD).
• A transition from long sleep duration (LSD) to short sleep duration (SSD) was associated with lower episodic memory scores.
• The mean age of all participants in the study was 59.1 years (standard deviation 9.8), with the less than 6 hours sleep group having a mean age of 61.0 years, the 6-8 hours group having a mean age of 58.1 years, and the greater than 8 hours group having a mean age of 59.7 years.
• Risks associated with both short and long sleep duration necessitate individualized sleep health interventions tailored to personal characteristics.
• A change from short sleep duration to long sleep duration is associated with lower global cognition scores (β=-0.94, P <0.001) in individuals aged 45 and older.
• For subjects with Long Sleep Duration (LSD) in Wave 1, the study classifies change patterns as: 'Excessive' (if there was one wave with Short Sleep Duration), 'No change' (maintained LSD in the two waves), 'Benefit 1' (maintained LSD in one wave and had Moderate Sleep Duration in another), and 'Benefit 2' (Moderate Sleep Duration in two waves).
• A sensitivity analysis excluding individuals with missing covariate data (n=6366) found that short sleep duration was associated with an adjusted OR of 1.23 for cognitive decline, and long sleep duration was associated with an adjusted OR of 1.47.
• Population-based research indicates potential cognitive impairments are associated with both short sleep duration (≤4 hours) and long sleep duration (≥10 hours).
• The study defines sleep duration categories as Short Sleep Duration (SSD), Moderate Sleep Duration (MSD), and Long Sleep Duration (LSD).
• The prevalence of hypertension was 26.7% in the less than 6 hours sleep group, 22.9% in the 6-8 hours group, and 25.5% in the greater than 8 hours group, with an overall prevalence of 24.2%.
• A change from long sleep duration to short sleep duration is associated with lower global cognition scores (β=-1.38, P <0.01) in individuals aged 45 and older.
• The study categorized 15,216 participants into three sleep duration groups in Wave 1: less than 6 hours (n=4,453), 6 to 8 hours (n=9,508), and greater than 8 hours (n=1,255).
• The use of tranquilizers was reported by 0.6% of the less than 6 hours sleep group, 0.2% of the 6-8 hours group, and 0.0% of the greater than 8 hours group, with an overall prevalence of 0.3%.
• Cross-sectional epidemiological studies have linked both reduced and increased sleep duration, as reported on questionnaires, with hypertension, diabetes, and obesity.
• The Whitehall Study did not obtain significant findings among people with short sleep duration (SSD) and lacked a sufficient sample size of individuals with long sleep duration (LSD).
• A history of heart disease was reported by 15.3% of the less than 6 hours sleep group, 11.1% of the 6-8 hours group, and 9.4% of the greater than 8 hours group, with an overall prevalence of 12.1%.
• Current smoking prevalence was 37.2% in the less than 6 hours sleep group, 40.0% in the 6-8 hours group, and 37.2% in the greater than 8 hours group, with an overall prevalence of 39.0%.
• The prevalence of depression among participants was 6.8% for the less than 6 hours sleep group, 6.9% for the 6-8 hours group, and 9.5% for the greater than 8 hours group, with an overall prevalence of 7.1%.
• The Guangzhou Biobank Cohort Study, published in Sleep in 2011, found that both short and long sleep duration are associated with memory impairment in older Chinese adults.