Place it right at the moment someone is shown asleep, then follow it with Anime Ahh for the confused reaction, or cut to Windows XP Error when the wake-up goes wrong.
關於此聲音
This is a 14-second alarm built around Hatsune Miku's bright, high-pitched Vocaloid voice, with a sudden, jarring tone that cuts through sleep. It feels startling and a little unsettling rather than gentle, like being woken by someone shouting right beside the bed. The sharp delivery makes it hard to ignore, even for heavy sleepers.