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An office interior lit from within, seen through glass windows at night

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Modern Life Wasn't Designed for Human Biology

by Solmate on Aug 10 2026
Modern life was optimised for convenience, not biology. The mismatch shows up quietly in mood, sleep, vitamin D status and energy. A worldview piece on how we got here and what to do about it.
A foggy street lined with bare winter trees, evoking the winter fog feeling

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The 'Winter Fog' Feeling, Explained

by Solmate on Aug 10 2026
Brain fog, sluggishness, flat motivation, the feeling that something is off but you cannot name it. What 'winter fog' actually is, how SAD and low vitamin D show up in the body, and when to see your GP.
A dim bedroom with a window on a grey winter morning, illustrating winter tiredness

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Why Winter Tiredness Feels Different

by Solmate on Aug 10 2026
Winter tiredness isn't the same as normal tired. It's heavier, less responsive to sleep, more diffuse. Why that is biologically — and how to tell ordinary fatigue from something worth addressing.
A view of a UK city street through a rain-covered window in winter

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Why the NHS Recommends Vitamin D in Winter

by Solmate on Aug 10 2026
The NHS recommends a daily 10 microgram vitamin D supplement for everyone over the age of one from October to March. Here is exactly why, what the SACN evidence says, and who needs to pay particular attention.
Why Modern Life Quietly Keeps Us Indoors

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Why Modern Life Quietly Keeps Us Indoors

by Solmate on May 18 2026
Modern life has quietly become indoor life. Daylight exposure has collapsed in a generation — and your body is feeling it. What is actually going on, and what to do about it before next winter.