Sleep Patterns in Children With Blindness: A Comparison With Normally Sighted Peers.

Purpose: Studies showing problematic sleep patterns in blind and visually impaired children are often based on (parent) self-report. The purpose was to compare sleep patterns of blind children to normally sighted peers using objective measures. Methods: In this cross-sectional study, 100 blind (best-corrected visual acuity <3/60) and 100 age- and gender-matched normally sighted children aged 7 to 17 years wore a digital activity monitoring device for 1 week. Sleep quantity (i.e., total sleep time and total time in bed) and sleep quality (number of awakenings, latency, efficiency, wake after sleep onset [WASO], and sleep fragmentation index) were measured. Adjusted linear regression analyses were used to model group differences in sleep parameters. Results: Data of 163 children were included. Blind children spent significantly less total time in bed in minutes (β, -31; 95% confidence interval, -56 to -6) and had a lower total sleep time (-41; -66 to -17), smaller number of awakenings (-2.8; -4.5 to -1.0), a lower WASO (-10; -16 to -5), and a more efficient sleep pattern (1.5; 0.1 to 2.8) compared to normally sighted children. Conclusions: Although sleep quantity and recommended hours of sleep per night were lower among blind children than normally sighted children, their sleep quality was better. This contradicts findings of self-report studies and warrants further studies to measure sleep objectively. Further, the discrepancy between previous findings and our findings regarding sleep quality may be explained by the house rules of the boarding schools attended by blind children, which may facilitate improved sleep hygiene.