I had to get a taxi at 6am on a Sunday, and had a chat about alarms with the driver. His solution is an old-fashioned wind-up alarm clock, the kind with bells on the top, positioned out of reach. Mine is to bang my head on the pillow - getting up at 5am? Five bangs. Then I wake up five minutes before the alarm. Yes, I still have an alarm, but I’ve trained myself to sleep through it. :-/