Should you leave bedroom windows open in hot weather? Experts reveal why 79°F (26°C) is the crucial threshold for closing your curtains and windows, the key bedroom window mistake to avoid in a heatwave, and the 4-step fix to follow instead for cooler sleep.

10 ways to stay cool when it's too hot to sleep

Should you leave bedroom windows open in hot weather? Experts reveal why 79°F (26°C) is the crucial threshold for closing your curtains and windows, the key bedroom window mistake…