Try this at home

A good way to give yourself the heebie-jeebies late at night when you're lying in bed and can't get to sleep is to listen carefully to the sounds that the possums make as they run across your roof and imagine that they are not being made by possums but by small grey rubbery-fleshed men trying to figure out how to get into your house.  It is especially effective to do this on a windy night so that you can hear them tapping and scratching at the windows.  Once that has got you thinking, stick your feet out the end of your bed for a while, then start to think about whether it's possible that one of those small grey rubbery-fleshed men has somehow crept into your room and is about to seize you around the ankle with his cool dry hand.  Keep your feet out of the end of the bed for as long as you can.  Make sure you don't ever open your eyes.