Daytime light exceeding 100 lux and higher light exposure ratios were associated with better rest-activity rhythms, fewer vigilance lapses, and better cognitive ability over 1 year (all p<0.05).
Observational (n=168)
Is daily light exposure associated with improved sleep, rest-activity rhythms, alertness, and cognitive function in adults with stable heart failure?
Higher daytime light exposure is associated with better objective cognitive performance and more stable rest-activity rhythms in patients with stable heart failure.
p-value: p=<0.05
We evaluated the associations between daily light and sleep and rest-activity characteristics, alertness, and cognition over 1 year among participants in a study of the effects of cognitive behavioral therapy for insomnia heart failure [N = 168 participants (Mean age = 63.2 + 12.7 y; n = 72/42% women; left ventricular ejection fraction p < 0.05). The phase difference was associated with insomnia, poorer sleep quality, and cognitive impairment over 12 months. Light levels and variability were not related to self-reported sleepiness, sleep quality, or insomnia symptoms.
Jeon et al. (2026) conducted an observational in Stable heart failure (n=168). Daily light exposure was evaluated on Associations between daily light and sleep, rest-activity characteristics, alertness, and cognition (p=<0.05). Daytime light exceeding 100 lux and higher light exposure ratios were associated with better rest-activity rhythms, fewer vigilance lapses, and better cognitive ability over 1 year (all p<0.05).