While there are plenty of cooling sleep products that promise to help you fall asleep during heatwaves, the key to a cooler night's sleep could actually be on your plate. Certain foods are excellent at managing body heat — but others can trigger night sweats and overheating.However, it can be hard to know which bedtime snacks can offer a hydration boost and which ones can lead to a stuffy, sleepless night. Even the size and timing of your evening meal can make or break your sleep.That's why I've called on Helen Tieu, registered dietician and founder of Diet Redefined, to share the best and worst foods to sleep through heatwaves. Read on to find out which light snacks can keep you refreshed all night, plus what time you should stop eating to avoid sleeping hot.Key takeaways: At a glanceManage temperature by opting for water-rich foods and light, hydrating snacks such as yogurt, fruit, and protein smoothies.Steer clear of heavy, fried or high-fat foods close to bedtime, as they force your metabolism to work harder and generate intense internal body heat during a heatwave.Hydrate throughout the day and stop eating two to three hours before bed to prevent heavy digestion from raising your core body temperature.The 2 best foods for sleeping well during heatwaves1. Food rich in fiber and protein