I have just finished erecting an Ikea bunk bed on my own: Parental leave I can't say it's been easy, assembling a mountain of wooden planks, each subtly different from the other, as demarcated by nothing more than a pin-sized hole into a structure that will withstand the relentless beatings of a small child. I'm not ashamed to say that I have cried, and shouted, and even thrown a very small and as-yet-unidentified piece of plastic at our sleeping cat. But our daughter will only turn four once, I think, and a bunk bed is all she's wanted since becoming obsessed by Topsy and Tim on CBeebies. A series made all the weirder since I turned on BBC1 at 8pm last Friday to find Topsy and Tim's mum - a relaxed and joyful character who routinely addresses her children with the prefix 'Twintastic' - having it away with Max Branning from EastEnders in a car. In any case, six hours later, the bunk bed is complete, and our daughter is thrilled. At 6.30pm that evening she announces it is bedtime and that she doesn't need a story. At 1.39am she appears in our doorway: "Actually mummy, maybe I don't want a bunk bed any more; maybe I just want a bike?."