Effects of daytime exposure to short-wavelength-enriched white light on alertness and cognitive function among moderately sleep-restricted university students

• DOI: 10.1016/j.buildenv.2024.111245
• Publication Date: 2024-02-02T02:54:33Z
• Authors: Mushfiqul Anwar S...; Leilah K. Grant; Alexandre Schaefer; Shamsul Haque; Shadab A. Rahman; Steven W. Lockley; Vineetha Kalavally
• Keywords: Alertness; Sleep

We examined the impact of an 8-h exposure to short-wavelength-enriched white light during day on cognitive performance, alertness, and mood moderately sleep-restricted university students in a simulated classroom setting. A total 28 participants (mean age: 23.57 ± 2.69; 19 female) were assigned one two conditions, each with equal melanopic daylight efficacy ratio (melDER∼0.9). However, they differed photopic illuminances, falling within upper lower limits prescribed standards for lighting: low illuminance (LI; 309.33 3.04 horizontal 128.26 7.37 vertical EDI lux) high (HI; 513 12.59 213.70 11.62 lux). Cognitive procedural memory, declarative subjective evaluated using N-back Task, Finger Tapping Free Recall Modified Karolinska Sleepiness Scale, Visual Analogue Scales, respectively. No statistically significant differences observed any measures between lighting conditions (p.adjusted > 0.05). These results indicate that exposures at illuminances current do not adversely affect mood, as assessed this study. findings have meaningful implications design, providing opportunity enhance energy efficiency without compromising working mood.