Thanks for replying, Sannah. Not that I'm aware of - I know that stress is supposed to make it worse, and I know that my hand will often go to my head if (for example) I'm being asked a difficult question or I'm struggling with coursework, but like I told I_WMD it can still be very hard to resist even when I'm relaxed, like when I'm reading, watching TV or at the computer. I think the computer is worst, for some reason, unless I'm typing.