📢 For people who sleep through everything
Loud Alarm Sounds for Heavy Sleepers
If your alarm rings and you don't, start here. These are the loudest and most piercing sounds in our library, measured at the same volume so you can compare them fairly. Your neighbors have been warned.
How we picked these sounds
- Measured, not guessed: we volume-matched every file and measured how loud each one is. These are the loudest.
- Sharp starts: most of them hit full volume in under a second, so there is no gentle intro to sleep through.
- High and harsh on purpose: shrill, buzzing and high-pitched sounds are the hardest to ignore.
- Tip: volume is only half of it. Put your phone across the room so you have to get up to turn it off.
Air horn
🔔🔔🔔🔔🔔One huge blast (repeats) · Full volume right away
0:03An industrial air horn from an oil rig in Canada. A 3-second blast that your phone repeats until you give up.
Air raid siren
🔔🔔🔔🔔🔔Rises, holds, falls · Fades in over 8 s
0:30A vintage air raid siren winding up to full scream. It builds for a few seconds, which makes it even harder to ignore.
Shrill alarm clock
🔔🔔🔔🔔🔔Piercing beeps, slowly rising · Full volume right away
0:54A real teenager’s alarm clock, so shrill its pitch creeps up as it goes. Measured as one of the loudest sounds here.
Digital alarm clock
🔔🔔🔔🔔🔔Beeps in quick groups · Full volume right away
0:24The bedside digital clock beep: quick beeps in groups, over and over. Not pretty, but your brain has learned what it means.
Alarm clock buzzer
🔔🔔🔔🔔🔔Fast buzzing beeps · Full volume right away
1:03A cheap alarm clock buzzer: rapid, scratchy beeps that never change. Ugly on purpose.
1920s klaxon horn
🔔🔔🔔🔔🔔A-OOH-GA honks · Builds up in 2 s
0:22A real klaxon from a 1925 Citroën: the "a-ooh-ga" horn from old films. Loud and funny at the same time.
Questions people ask
What is the loudest alarm sound?
In our measurements the air raid siren is the loudest, followed by the shrill alarm clock. The air horn also gets 5 out of 5 on our wake power scale because it hits full volume instantly.
What alarm sound is best for heavy sleepers?
A sound that is loud, high-pitched and starts at full volume, like the air horn or the shrill alarm clock. Changing your sound every few weeks also helps, because your brain learns to ignore a sound it hears every day.
Why do I sleep through my alarm?
Common reasons are not enough sleep, waking up in deep sleep, and getting used to the same sound. A louder, unfamiliar sound helps, and so does timing your alarm with a sleep calculator so you wake between sleep cycles.
Is it bad to wake up to a loud alarm?
It is not harmful at normal phone volumes, but a sudden loud alarm can leave you feeling jumpy and groggy. If you can, use a louder sound as your backup and something gentler as your first alarm.