I've been informed by my girlfriend I fell asleep last night and then when my wrist weakened enough, introduced the iPad to my head. This has happened enough that I didn't even think of it, but do remember a little painAWAKE! moment. No bruises and with a TPU cover covering the edges (for the correct model), I still wonder if it could be something else? Anyway, that's all the detective work has dug up. Beware in-bed use for now.