Christian Cajochen

The paper analyzes prediction error processing during sleep using information-theoretic methods, finding reduced and redundant neural information with deeper sleep and REM.

This study compares light exposure and behaviour in Switzerland and Malaysia, finding cultural and geographical differences in light exposure patterns and the relationship between self-reported and objective measures.

This study examines how sex and seasonality affect melatonin suppression and alertness to light, finding sex differences and seasonal variations in light sensitivity.

This study finds that afternoon-early evening bright light exposure in adolescents reduces later evening melatonin production without affecting sleepiness or vigilance.

This study tests if cone photoreceptors affect melatonin suppression and alertness to light at night, finding no significant effect.

This study investigates the impact of blue-yellow light changes on the human circadian clock and sleep, finding no significant effects under moderate light levels.

This study investigates whether high-melanopic light affects sleep and vigilance, finding no differential effects despite melatonin suppression.

This study shows that regular daytime caffeine intake in men reduces REM sleep promotion and worsens sleep quality compared to placebo.

This study shows daily caffeine intake impairs working memory and reduces hippocampal activity in healthy adults, with acute withdrawal also affecting cognitive performance.

This study shows that daily caffeine intake reduces grey matter volume in humans and impairs working memory, suggesting potential long-term cognitive detriments.

This study examines circadian and sleep phenotypes in individuals with congenital achromatopsia, finding that they maintain regular rest-activity patterns despite severe light sensitivity and reduced daytime light exposure.

This study investigates the impact of daily caffeine intake on nighttime sleep in habitual consumers, finding no significant differences in sleep structure or quality but reduced sigma frequency EEG power density, suggesting early signs of overnight withdrawal.

This study examines how daily caffeine intake and withdrawal affect circadian rhythms and wakefulness in habitual consumers, finding no significant changes in melatonin or cortisol but increased sleepiness and attentional lapses during withdrawal.

The paper tests if S cones contribute to circadian light responses and finds no evidence, suggesting melanopsin is the sole driver.

The paper introduces a framework to quantify visual and non-visual effects of short-wavelength light filters using factors like luminance, melanopsin activation, color shift, and gamut reduction.