The IO8 Research Journal

01. Total darkness: why a hotel room is almost never dark Oct 08, 2026

02. Silence: below 30 dB at night, what it takes Oct 08, 2026

03. Room temperature: why 18 to 19 °C Oct 08, 2026

04. Air and CO2: 800 ppm, what is measured at night in a closed bedroom Oct 08, 2026

05. Water: filtered in the room, and pool water Oct 08, 2026

06. Strength after 55: why a cardio room is not enough Oct 08, 2026

07. Evening and morning light: 2,700 K and 1,000 lux Oct 08, 2026

08. Bedding and sleep: what a sleep sensor measures, and what it does not tell you Oct 08, 2026

09. Recovery: heat, cold, red light, compression Oct 08, 2026

10. The data the guest keeps: why the hotel should retain nothing Oct 08, 2026

11. Why no one publishes the measurements of their rooms Oct 08, 2026

12. Device lending in hotels: from Four Seasons to the four-star room Oct 08, 2026

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