# Seasonal darkness and light exposure health impacts

> Live situation record from CLSTR: https://clstr.news/situations/seasonal-darkness-and-light-exposure-health-impacts
> Updated: 2026-10-25T13:34:01.000Z. Sources: 3. Developments: 2.

Scientific research and medical experts have highlighted the biological impact of reduced daylight hours, particularly surrounding the winter solstice. The reduction in solar altitude and daylight is linked to changes in melatonin and cortisol production, which can lead to seasonal exhaustion and fatigue.

In response to these seasonal shifts, health professionals, such as those in Finland, recommend preventative measures to manage symptoms like low mood, fatigue, and weight gain. Recommended strategies include morning exposure to natural sunlight and the use of bright light lamps to regulate circadian rhythms and boost serotonin levels.

## Timeline

### 2026-10-25: Finland experts advise on managing seasonal darkness fatigue

Psychiatry experts in Finland recommend light exposure and outdoor activity to combat seasonal darkness fatigue as winter approaches.

3 sources. https://clstr.news/cluster/finland-experts-advise-on-managing-seasonal-darkness-fatigue

### 2026-09-27: Winter solstice and seasonal fatigue linked to light exposure

The winter solstice on December 21 brings shorter days and seasonal fatigue due to Earth's axial tilt. Experts recommend morning sunlight exposure to regulate hormones and combat exhaustion.

2 sources. https://clstr.news/cluster/winter-solstice-and-seasonal-fatigue-linked-to-light-exposure

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Cite as: Seasonal darkness and light exposure health impacts. CLSTR, https://clstr.news/situations/seasonal-darkness-and-light-exposure-health-impacts