Wake-up call (service)
WordNet
noun
(1) A telephone call that you request be made a specific time in order to wake you up at that time (especially in hotels)
"She left a wake-up call for 7 a.m."
(2) A warning to take action concerning something that was overlooked or neglected
"The bombing was a wake-up call to strengthen domestic security"
WiktionaryText
Noun
- A telephone call to awaken someone at a certain time, especially one requested by the person while staying at a hotel.
- She requested a five a.m. wake-up call from the front desk.
- An alert, reminder, or call to action caused by a dramatic event.
- The recent deaths should serve as a wake-up call to others at risk.