Sleep scientist urges everyone to ‘avoid’ one thing before bed during heatwaveAn expert has revealed how Brits can stay cool amid the August heatwaveView 2 Images Sleeping during the heatwave can be extremely difficult (Image: Getty Images)A sleep scientist is urging everyone to avoid doing this one thing before going to bed during the heatwave. ‌To help Brits stay cool overnight, a sleep scientist has now shared her expert insight into how heatwaves impact sleep, alongside tips for improving sleep quality and mistakes to avoid as temperatures skyrocket. “Your core body temperature naturally reaches its lowest during deep sleep, when the body is fully relaxed, and recovery processes take place. If your core body temperature cannot cool down correctly, it can be harder to reach and maintain these deeper stages of sleep. "So, eating large complex meals just before bed will cause your core body temperature to increase when you need it to decrease."