Wake-up call (service)
A wake-up call is a service provided by lodging establishments allowing guests to request a telephone call at a pre-specified time, thus causing the guest to wake up at that time. It is similar in concept to an alarm clock, but is instead conducted via a telephone. A similar concept is used by hotel establishments in Africa, where it is referred to as "Amka, Amka".
The phrase has also been used to describe an alert someone may receive regarding the consequences of negative circumstances or dangerous behavior.
