that's quite a good way to ease anxiety as well kitty - good one! (or I can offer you an interesting article from a GIT journal on the small intestine, or worse, a HUGE textbook on teeny mechanisms in membranes of .. stuff... instant sleep
I find trying to stay awake = I get tired 
lostonthemoors poor DS and poor you. Good that sharing with a medic didn't rub off on you too much - I am a really mean mummy I'd probably leave my DS (now 3) I severely lack empathy. I come from a family of a mum who was a nurse, she was even meaner!
if anyone's still up in an hour's time I will teach you some horribly long mnemonics