We had quite a few suggestions in this vein, ranging from bed sheets and clothes to wet tea towels. But basically, the take-home message is: if you can fit it in your freezer, shove it in there. Pyjamas and bedding are obviously the priority. Remove your duvet from the duvet cover and pop the cover in the freezer. You can also put a wet tea towel in for a few hours and then apply it to your forehead or the back of your neck. Whatever you're putting in the freezer, make sure it's in a plastic bag or some kind of container. Otherwise, it could absorb the smell of anything else that's in there (trust us, we've had things coming out smelling of chips).