When sleeping under a duvet, turn down your heat at night to save energy and/or open your window. It has been proven that breathing cool, fresh air does wonders to help you relax and have a sound, healthier sleep. Wear light-weight, loose-fitting night clothes to promote natural relaxation. Do not tuck in the duvet - sometimes use just a part of it, letting your arms and feet hang out - this is a freer way of sleeping! During the night, if you wish to change the temperature under your duvet, simply lift it and give it a slight fluff. The cooler air in the room will immediately filter through. For hot summer nights, your duvet with tunnels is fully adjustable. The down can be punched to the end to make the part on top as thin as you wish.