Janine Weibel

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 investigates the acute effects of caffeine on sleep and circadian timing in teenagers, finding reduced sleep quality and delayed melatonin onset.

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.