Multiple realities(covers information from several alternate timelines)
An alarm clock was a type of clock that roused individuals from sleep at a particular set time.
In 2259 of the alternate reality, Thomas and Rima Harewood's apartment had an alarm clock in it. (Star Trek Into Darkness)
In 2364, Data referred to devices on his person that timed his unconsciousness as an android alarm clock. (TNG: "Datalore")
In 2376, after B'Elanna Torres snapped Tom Paris out of the spell that the starship Alice had placed on him, he thanked her for being his alarm clock. (VOY: "Alice")