[pierrefar]

I've had hotel wake up calls NOT happen. For really-must-wake-up-on-time situations, you need to diversify: phone + hotel + a tiny clock.

[yardie]

I wonder if this is a bug in general? Hotel wakeup calls are done by automated services these days, atleast for every hotel I've stayed in for the last 10 years.

If you think hotel wakeup calls are unreliable and they all use the same wakeup call software then the problem may be in the code.