Sleep disturbances and delayed sleep timing precede neurological disease

Area of Science:

• Neurology
• Sleep Medicine
• Epidemiology

Background:

• Sleep disturbances are linked to increased neurological disease risk.
• The role of sleep issues as modifiable risk factors or early disease signs requires clarification.

Purpose of the Study:

• To investigate the relationship between multiple sleep dimensions and neurological disease onset.
• To examine sleep pattern changes before and after neurological disease diagnosis.

Main Methods:

• Utilized longitudinal data from 24,033 participants in the Swedish Longitudinal Occupational Survey of Health (2010-2018).
• Identified incident neurological disease via national registers.
• Analyzed associations using Cox proportional hazards models and sleep variable trajectories with linear mixed-effects models.

Main Results:

• Persistent fatigue, non-refreshing sleep, and sleep-disordered breathing were associated with increased neurological disease risk.
• Insomnia alone was not a risk factor, but became significant when combined with daytime symptoms.
• Individuals who developed neurological disease showed a shift towards later sleep times and increasing insomnia, fatigue, and sleep-disordered breathing years prior to diagnosis.

Conclusions:

• Sleep symptoms and altered sleep-wake timing precede neurological disease diagnosis by several years.
• These sleep changes may indicate early prodromal alterations in brain function.
• Sleep complaints show potential as early indicators for neurological health surveillance.