Night watch
The health-tracking watch I got for Christmas claims to know when I am awake or in light, REM or deep sleep. How does it do this?
Jenny McCabe, Folkestone, Kent, UK
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Blowing hot and cold
In summer, I feel comfortably warm when the thermometer in my living room shows 20°C. Yet in winter, I feel cold at the same temperature. What causes this?
Perry Bebbington, Kimberley, Yorkshire, UK
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