Scott, J., Langsrud, K., Goulding, I., & Kallestad, H. (2021). Let there be blue-depleted light: In-patient dark therapy, circadian rhythms and length of stay. BJPsych Advances, 27(2), 73-84. doi:10.1192/bja.2020.47

Light is the most important environmental influence (zeitgeber) on the synchronization of the circadian system in humans. Excess light exposure during the evening and night-time affects secretion of the hormone melatonin, which in turn modifies the temporal organization of circadian rhythms, including the sleep–wake cycle. As sleep disturbances are prominent in critically ill medical and psychiatric patients, researchers began to examine the impact of light exposure on clinical outcomes and length of hospitalization. In psychiatric inpatients, exposure to bright morning light or use of blue blocking glasses have proved useful interventions for mood …