Here's an interesting BBC article about the history of sleeping patterns... The myth of the eight-hour sleep http://www.bbc.co.uk/news/magazine-16964783 It turns out that we haven't always slept for eight(ish) hours in a row, but we used to have a split night, with a 'first sleep' for four hours, then a two-hour chilled-out waking period, and then a 'second sleep' for another four hours. I've always had unusual sleeping patterns, and I've always enjoyed waking up in the middle of the night, or going to bed very late, so it's nice to read that it's perfectly 'normal'! And I've always thought that the Spanish have a great system where they have late sociable nights, and then a siesta during the day to make up for it. I'm now wondering if a split sleeping pattern would help with the ME, but I'm not sure if it would... I think it would just make the night-time too long.