A pilot study of a sleep problem measure in Parkinson's disease

The SCOPA-Sleep scale demonstrated high internal consistency with alpha values of 0.84 for nocturnal sleep and 0.75 for daytime sleep.

• The nocturnal sleep subscale showed a mild ceiling effect of 22.1%.
• Defective convergent validity was identified for a daytime sleepiness item.
• A strong negative correlation was observed between nocturnal sleep and patient sleep disturbance scores (rs = -0.70).
• A weaker correlation was found between daytime sleep and sleep disturbance scores (rs = -0.41).
• Both patient and caregiver health-related quality of life exhibited a loose association with sleep measures.

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