Hey, sorry, I know this sounds stupid, but I've just made two sponges ready to decorate for tomorrow (Its like 1am now) ..Anyways, I was wondering, would it be alright If I put the buttercream on it now too, and keep it in the fridge over night?

If your house is cool there really is no need to refridgerate. go ahead and ice. You'll be fine!

Jibbies

Nah it's quite warm here at the minute so I was a little concerned. thankyou for the advice.