My ds is almost four and frequently laughs spontaneously. This can happen at any point during the day or night and we haven't a clue what he's laughing at. A friend has recently told me that sometimes this can point to epilepsy. I have been concerned for some time about absent seizures (he is absent for a good chunk of the day) however we did ask his paediatrician about these and she seemed to think it was just the nature of his condition rather than a seizure. I've never mentioned the laughing as I had no idea this was relevant to epilepsy. He's not due to be seen again for a year and I'm just a little worried now.