The Science Behind “Winter Brain Fog” — And Why It Happens More on Weekends
The Science Behind “Winter Brain Fog” — And Why It Happens More on Weekends
IN · Published Dec 19, 2025
• Winter brain fog is a real phenomenon causing sluggishness and reduced mental sharpness during colder months.
• Reduced sunlight, vitamin D deficiency, and changes in routine contribute to winter brain fog, worsened by weekend sleep disruptions and dietary indulgences.
• Combat winter brain fog by getting sunlight, maintaining a routine, eating well, staying active, and considering vitamin D supplements.
Understanding winter brain fog and weekend connection
Many people feel mentally slow during winter, especially on weekends. This is known as “winter brain fog,” and understanding the reasons behind it can help manage it.
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