Thought I'd share this as if you have young kids you may want to be aware of some scary stuff that can happen and is apparently quite common.
On Thursday last week, my 4 year old was walking home from school with Mum. Teachers said he had been tired and lethargic that afternoon - but he'd been fine that morning. Anyway, on the walk home, out of the blue, he went floppy, eyes rolled back in his head and he stopped breathing. He went blue and panic ensued. Long story short, he came around after a minute or so, was taken to A&E by ambulance, and spent the next 4 hours in hospital being checked out. He had a high temperature but was otherwise fine. He was poorly the next day but is now back to normal.
We've been told there is around a 1 in 25 chance of this happening up to the age of 6. There are no harmful after effects (although I think a couple of years have been taken off mine and the wife's life expectancy with the shock/panic).
Worth googling febrile convulsions if you have young ones.

