Overview
- Late‑May lifestyle coverage has promoted two low‑cost hacks: hang a damp but not dripping towel or sheet in front of an open window, or chill a sheet in the freezer for about 15 minutes before bed.
- The towel method cools incoming air by evaporation, which draws heat from the air as water turns to vapour, so some airflow is needed for the effect to work.
- Freezing or briefly chilling sheets and using cold water bottles or slightly damp socks aim to lower core body temperature so people fall asleep more easily.
- Medical and home‑cooling experts caution against oversaturating fabrics because excess moisture can raise indoor humidity and reduce comfort, and they point to official UK advice limiting fan use to air temperatures below 35°C.
- With limited domestic air conditioning and rising temperatures this summer, these cheap hacks offer practical relief for sleepers but carry trade‑offs for humidity, allergy sufferers and vulnerable people.