A lot of ABer's suffer with insomnia. There are usually several posting through the small hours. I sleep for three or four hours and then like Lottie spend the rest of the night thinking and trying desperately to go back to sleep. Sometimes I get up and make a cup of tea (decaff) which just makes me want to visit the loo and does nothing to help me sleep. I am, of course, in the fortunate position of being able to rest during the day, although I never sleep, just doze.