The purpose of a hotel alarm clock is not to wake you up. It’s to make you concerned enough as to whether or not it works that you wake every hour on the hour in order to make sure that it hasn’t failed to wake you up and thus miss your plane. This particular clock excels and we wake at 2.30, 3.30, 4.30 and, finally, 5.30 in the nick of time for the hotel shuttle bus to whisk us away to Terminal 3.