An alarm clock
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 2366, Ensign Wesley Crusher forgot to set his alarm and fell asleep. He was later awoken by William T. Riker from the bridge via combadge communications. (TNG: "Evolution")
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")
In 3188, Aditya Sahil used a holographic bird displaying the time as an alarm clock to wake up every morning at 8:00 a.m., despite being the lone resident of an all-but-abandoned relay station. (DIS: "That Hope Is You, Part 1")