I baked a cake this evening for a birthday tomorrow. It just came out of the oven and I would very much like to go to bed sooner than later. Is it ok to cool overnight? I've seen advice elsewhere online to cover it with a tea towel (some people said that didn't work and the cake dried out) and I've seen advice to wrap it up in plastic wrap when I take it out of the tin and leave it out (or refrigerate it). Any thoughts?