Hypnogogic jerk sounds like the name of the newest superstar dubstep DJ, or perhaps some kinky new 51st shade of grey, but in fact it’s scientific term for the occasional, involuntary muscular movements as we drift off to sleep. Why these muscle spasms occur is still a bit of a mystery but this short article from LiveScience offers a couple of interesting hypotheses including the brains simple miss-firing of neurons. Who knew the most complicated organ in our body could get something wrong. In any case, if you find yourself abruptly awoken from your slumber and unable to drift back to dream land, lie back, relax and read a comic.