If you only come to Prague for a few days, your body clock still stays tuned in to your regular time zone, so you’re up at six local time because your brain tells you it’s actually 9AM already. If you normally wake up at seven, than four in the morning is definitely time to get up in Prague. Being out of bed this early may look somewhat extravagant, of course, but you never manage to go back to sleep till (at least) seven o’clock. Here you are, leaving the hotel at 5:30AM, walking down Charles Bridge, perhaps as far up as Prague Castle...