Put it at the very start of a wake-up scene, before any dialogue, so the alarm sets the moment. Follow it with a Bell Ding when the character finally gets up, and keep it as the opening cue for the rest of the scene.
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This is a short Samsung phone alarm tone, lasting about two seconds, built to catch attention fast in a quiet room. It feels urgent and insistent, the kind of sound that makes you sit up and check the time at once. The Cesium label sets it apart from other Samsung alarm tones on the same phones.