it has happened to me a few times now. Stagger into bed after a late night flight only to be woken by the hotel room alarm clock at 3am or having promised oneself a long overdue sleep in to have that reality disturbed at 5am by the hotel room alarm clock

Sometimes guests manage to leave and forget the alarm clock settings.

It is worth saving a quick check to make sure you are not going to be woken at an ungodly hour