Why can't I sleep the night before a match

. Last night I had everything ready, didn't have to be up too early, had a couple of beers (only a couple scatty), no pressure at all. So why was I waking up every 20 mins looking at the clock

Mind you it wasn't helped by the 'number witheld', phone call at 5 o clock

If that was you scatty I'll get you back and so will Shirl
Does anyone else have trouble sleeping the night before a match ???