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Weather and sleep: heat, daylight, and pressure — what the evidence actually shows
Heat and a stuffy bedroom, daylight and your body clock, and barometric pressure: three ways weather might touch your sleep — and, honestly, only two of them hold up under evidence.
Sleep debt: how to actually think about it
Where 'sleep debt' comes from, what chronic sleep restriction research shows, why weekend catch-up sleep falls short, and why your own trend and regularity matter more than an hours-based number.
Wrist temperature during sleep: what Apple Watch is actually tracking
Apple Watch reports a nightly wrist-temperature deviation from your own baseline, not your body temperature. What that signal reflects — cycle, sleep, feeling unwell — and what it doesn't.