Effects of light on human circadian rhythms, sleep and mood

What the study found

Light timing, spectrum and intensity can alter circadian rhythms, sleep and mood through retinal pathways beyond image-forming vision.

Limitations

Laboratory dose-response evidence does not translate directly to a single architectural lighting recipe.

Neurodesign interpretation

Lighting is a biological schedule embedded in architecture. The same fixture can support daytime alertness and undermine night-time physiology depending on when and how it is used.

Possible design implications

Specify light by timing and melanopic stimulus as well as visual illuminance, and distinguish day from evening goals.

Why it stays in the corpus

Retain as a compact mechanism review for non-visual light effects.

Study design

Review

Population

Humans

Setting

Laboratory and naturalistic light exposure

Field

Lighting, circadian science

Mechanism

Melanopsin, circadian phase, alertness, mood

Spatial variable

Light intensity, spectrum, timing, duration

Keywords

circadian, melanopsin, light, sleep, mood