Hi Roudysmum
They are dreadful, they get sooooo upset.

My DS had them for a little while, we could tell the time by them as they happened at 3am every morning for about a month - absolute hell as they started 2 weeks before DD was born.
We found that cutting down the amount of TV he was exposed to during the day has seemed to help - my mum & stepdad were living with us at that time and stepdad would have the TV on from 6am - 11pm everyday we also started buying glowsticks for him and he helps activate them and connects them up and they provide a nice soft light in his room.
The other thing we did was to remove additives from his diet - this was also as he was starting to have nasty tanties.
He has had one or two since and that may have been also due to him getting too hot or too cold.
Hope this helps.