Sleep Disorders in Early-Onset Parkinsonism: A Population-Based Study

Area of Science:

• Neurology
• Sleep Medicine
• Epidemiology

Background:

• Sleep disturbances are prevalent in parkinsonian disorders.
• The impact of sleep disorders on early-onset parkinsonism remains unclear compared to typical-onset cases.

Purpose of the Study:

• To compare sleep disorder prevalence and incidence before and after motor symptom onset.
• To differentiate sleep disorder patterns between early-onset parkinsonism (age ≤50) and typical-onset parkinsonism (age >50).

Main Methods:

• Population-based cohort study (1991-2015) with 38 early-onset and 1,001 typical-onset parkinsonism patients.
• Medical records were reviewed for sleep disorder presence, type, and relationship to motor symptoms.
• Logistic regression and Cox proportional hazards models analyzed sleep disorder rates pre- and post-parkinsonism onset.

Main Results:

• Sleep disorder prevalence before parkinsonism onset was similar (24% vs. 16%).
• Post-onset incidence rates were comparable (5.85 vs. 4.11 cases per 100 person-years).
• Early-onset parkinsonism showed a higher risk of post-motor insomnia (HR 1.73).

Conclusions:

• Sleep disorders are common in early-onset parkinsonism, occurring with similar overall frequency as in typical-onset parkinsonism.
• Insomnia is a notable exception, being more frequent in the early-onset group after motor symptom onset.
• Findings highlight specific sleep disorder risks in early-onset parkinsonism.