Of course it wasn’t just a silly idea! It’s a highly practical, cheap (if done the shonky DIY way) and fairly comfortable sleeping mat. Sadly I have decided that for things where I’m only carrying my rucksack to the campsite, taking a proper mat might be a better idea. Having said that, I wasn’t cold, it was comfortable enough and it is small and light.
Not only that, but how often do you get to make balloon models out of your bed while cooking power assisted super turbo adrenalin snacks for breakfast?