My one-year-old son just won't sleep.

I've read all the books, have a very strict bedtime routine, have tried controlled crying, filling him up with milky foods before bed and cutting his naps to nil during the day.

He generally goes to sleep easily at his 7pm bedtime. Yet still, every morning between 2 and 4am - sometimes longer, he wakes up and plays - very loudly. These play sessions include very loud whooping noises, lots of banging and generally plenty of moving around.

I try very hard to ignore him - and have managed not to go in and see him to re-settle him for several nights - but this only seems to make it worse. If I don't go in, re-wrap him and settle him down, the play sessions can last a couple of hours or more. And if I do, he wakes again an hour or so later, and we go through it all over.

The next day, he is miserable, cranky and difficult to deal with - but if I let him have daytime naps - he's even worse the following night.

I'm at the end of my tether - after a year of pure sleep depravation, it's really taking it's toll on my marriage. I also have to work from home, which is difficult when my son is grumpy and tired.

Please please please! There must be an answer out there - although before anyone suggests it, calpol doesn't work either - i've tried that too.