Yep I've had her cot mattress elevated. Did I also mention she's become aerodynamic? One night I got up to feed her to find her parallel with the bottom of the cot and her blanket completely covering her face and body. I completely freaked out but I knew she was fine as I could hear her talking under there and it was just a light breathable bamboo blanket. Still, SIDS alarm bells went off and she is a very wriggly baby so I bought a Swaddle Me Up swaddle so she wouldn't need a loose blanket... Anyway she loves her new swaddle but it's made her aerodynamic like a Speedo because now I ALWAYS find her in odd places in the cot. Upside down, sideways, at the bottom... Anyway nothing to do with her nap time hysterics but gosh babies are funny sometimes.