Got woken up at 2 am by a huge crashing noise. I thought the ceiling had fallen down, but I discovered that a stack of paintings had fallen over and knocked over my easel. I can't understand why it all fell over, unless it was a poltergeist. I tend to think it was probably natural causes as I have never had a poltergeist before. I think the wooden frame of one of my canvases warped until it reached tipping point and it fell over bringing down the rest.