Symptoms of sleep disorders and objective academic performance.

Objective: We aimed to compare the academic performance of children with and without symptoms of sleep disorders (SSD).

Methods: We distributed 5400 questionnaires (Sleep Disturbance Scale for Children [SDSC], Brazilian version) to 7- to 10-year-old children at public elementary schools in São Paulo, Brazil. We analyzed the academic grades of Portuguese (Port) and Mathematics (Math) in 2384 children (1224 girls; 51%).