Insomnia!

It's 5.30am on Sunday morning at the moment and I'm writing this post instead of sleeping. Only problem is I've been up since about 1.30am. The last few days my sleep patterns have been all over the place, had about 6 hours sleep Thursday night and woke up at 4am, then crashed on Friday at 11pm and woke up at 10am. Went to bed at 10.30 or so last night and BAM! Eyes open at 1.30am and brain switched on. Have been fiddling around with my web site until 4.30am or so, then tried to go back to bed. No good - my mind is stubbornly refusing to shut down. Decided that I might as well be doing something useful so here I am, bleary-eyed and typing away when I should be sleeping peacefully. Oh well....