We tested the effect of different lights as a countermeasure against sleep-loss decrements in
alertness, melatonin and cortisol profile, skin temperature and wrist motor activity in healthy …

Light exposure elicits numerous effects on human physiology and behavior, such as better
cognitive performance and mood. Here we investigated the role of morning light exposure …

The widespread use of electric light and electronic devices has resulted in an excessive
exposure to light during the late-evening and at night. This late light exposure acutely …

Exposure to bright light is typically intermittent in our daily life. However, the acute effects of
intermittent light on alertness and sleep have seldom been explored. To investigate this …

Many people in our modern civilized society sleep later on free days compared to work days.
This discrepancy in sleep timing will lead to so-called 'social jetlag'on work days with …

Light in the short wavelength range (blue light: 446–483 nm) elicits direct effects on human
melatonin secretion, alertness and cognitive performance via non‐image‐forming …

Objectives Exposure to light can have acute alerting and circadian phase-shifting effects.
This study investigated the effects of evening exposure to blue-enriched polychromatic white …

Light during the day and darkness at night are crucial factors for proper entrainment of the
human circadian system to the solar 24-h day. However, modern life and work styles have …

The human circadian clock regulates the daily timing of sleep, alertness and performance
and is synchronized to the 24-h day by the environmental light-dark cycle. Bright light …

Light, one of the key environmental components for both life and work, played significant
role in subjective feelings (eg affect and comfort), but the exact effects and mechanisms …