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 …

Objective: Environmental (little outdoor light; low indoor lighting) and age-related
physiological factors (reduced light transmission through the ocular lens, reduced mobility) …

Aims: The study aims to assess the prevalence of smartphone addiction and its effects on
sleep quality among medical students. Study Setting and Design: A cross-sectional study …

Circadian rhythm disturbance is a common feature of many psychiatric disorders. Light is the
primary input to the circadian clock, with daytime light strengthening rhythms and night-time …

Objectives This study evaluated the effects of bright light and melatonin on adaptation to
night work on an oil rig in the North Sea. Methods Seventeen persons working a schedule of …

The alerting effects of both caffeine and short wavelength (blue) light have been consistently
reported. The ability of blue light to enhance alertness and cognitive function via non-image …

BACKGROUND: While light has proven an effective treatment for Seasonal Affective
Disorder (SAD), an optimal wavelength combination has not been determined. Short …

The rapid increase in the number of smartphone users has raised concern about the
negative psychosocial and physical effects of this use. A descriptive cross-sectional design …

Objective Sleep is critical for our mental health and optimal cognitive functioning. Social
media use is increasingly common and suspected to disturb sleep due to increasing …

To quantitatively assess the association of problematic smartphone use (PSU) with poor
sleep quality, depression, and anxiety, we reviewed current evidence from observational …