I usually unplug the alarm clock so I have an electrical socket for my CPAP.

I once forgot to change the time zone setting on my phone. I needed to be in the lobby at 5.30 am. Woke up, showered, checked out. I got a few strange looks from checkout but being in zombie mode it didnt register.

After 10 minutes and none of my other party showing up was wondering if there was something amiss. looked at the various time zone clocks on the wall to work out it was 00.40 not 5.30. Checked back in and went to sleep.