Association of perceptions of artificial light-at-night, light-emitting device usage and environmental noise appraisal with psychological distress, sleep quality and chronotype: A cross sectional study

Perception of external artificial light-at-night (ALAN) was associated with poorer sleep quality, more cognitive failures, and greater psychological distress.

• Perceived external ALAN negatively correlated with sleep quality and increased cognitive failures.
• Higher psychological distress was linked to perceptions of external ALAN in the sleeping environment.
• No significant relationship was found between the perception of ALAN and the biologically-relevant melatonin-suppression index (MSI).
• Internal lighting entering the sleeping environment correlated with poorer sleep quality but not with psychological wellbeing.
• Use of light-emitting devices was associated with poorer psychological wellbeing, but not with sleep quality or timing.
• Perception of environmental noise annoyance at night was associated with higher psychological distress and poorer sleep quality.

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