I find it easier to get out of bed at 530 than at 715. I'm not sure why, but at 530 there's no flailing for the snooze button and crawling back under the duvet, curling back into the bit still warm. I tumble out and rub my eyes. The cat looks at me funny, if he's there. Sometimes he's gone for an early breakfast, and is returning up the stairs, surprised to find me stumbling down in the other direction. My legs take awhile to work in the mornings, due to a condition called 'getting older' and getting down the stairs is precarious to say the least. At 715, I know I can get away with a minute here or there. An extra 9 in bed can be made up by skipping a shave or espresso. In fact, my espresso machine is on the fritz at the moment. Verging on calamity, that.
At 530, though, there isn't time to mess about. If I've set my alarm for so ungodly an hour, it's because I have something to do. Make wine; catch a plane; make a train. Something that just won't wait is afoot, and somewhere along my staggered road to being a grown-up, I've managed a degree of diligence in such things. I don't like it. I like waking up at 930.
930 is early enough that you can have breakfast without it reducing the appetite for lunch, while still giving you the satisfaction of not waking up at 530, 630, 730 or 830.
In any case, I made my train with ten minutes to spare. The tube was quiet, and the train nearly empty. Heading north as the bleak turns to dreich. It's a random trip, this. I'm not sure what on earth I'm doing, but hopefully I'll work it out by the time I head back tomorrow.