Leng Y, et al. - Researchers investigated the association between subjective daytime sleepiness or objective napping and the long-term risk of Parkinson’s disease (PD) in older men (mean age 76 years) without a history of PD, followed for 11 years. Using logistic regression, they compared four groups with respect to PD risk: no excessive daytime sleepiness (EDS) and napping <1 hour/day (referent group), EDS and napping <1 hour/day, no EDS and napping ≥ 1 hour/day and EDS and napping ≥ 1 hour/day. They found a prospective association between objective long napping and a higher risk of PD in older men. No such association with subjective EDS was found. Objective measures of napping could be a preclinical marker for PD.