An RMIT Study Tested Alarm Sounds for Sleep Inertia. The Results Were Not Obvious.
Jarring beeps aren't the most effective wake-up sound — a 2020 study from RMIT University found that melodic alarms reduced morning grogginess more than harsh tones. Five specific changes that follow from this.
In this article5 sections
Researchers at RMIT University in Melbourne, led by Stuart McFadyen, published a study in PLOS ONE in 2020 examining which alarm sound properties were associated with lower sleep inertia — the period of cognitive sluggishness immediately after waking. Their finding: melodic alarms (those with clear harmonic or ascending tonal structure) were linked to significantly lower self-reported sleep inertia scores than harsh, non-melodic alarms like standard beeping. The researchers hypothesized that melodic sounds may be processed more efficiently by the auditory cortex during the wake transition, requiring less of the orienting response that abrupt sounds demand.
Put plainly: the shrieking default alarm may be the worst tool for the job.
1. Swap beeping for something melodic
The RMIT study’s core finding holds across different music preferences: what matters is tonal structure, not genre. A gently ascending marimba pattern, a guitar arpeggio, or even a pop song with a clean melodic intro all perform better than a flat-frequency beep. Abrupt sounds activate a hard neurological pivot from sleep state to high-alert wakefulness; melodic sounds allow a more graduated transition, which appears to shorten the grogginess window.
Most modern smartphones have melodic options in their default alarm library. The iOS “Ripple” and Android “Argon” presets are both more tonal than the standard beep.
2. Set volume to increase gradually
A loud alarm from silence triggers the same hard orienting response as an abrupt sound. A gradual volume increase — from near-silence to moderate over 30 to 60 seconds — allows the cortex to process the incoming sound before full arousal is demanded. Most alarm apps include a “fade in” option; it’s worth 30 seconds to find it.
3. Avoid songs with strong emotional associations
Using a song you love as your alarm is a reasonable idea that tends to fail within two weeks. The reason is classical conditioning: once a song becomes paired with the unpleasant experience of mandatory waking — repeated daily — it begins to carry those associations. Pick something neutral-pleasant that you’ve never heard outside of waking up.
4. Rotate your alarm sound every few weeks
Even a well-chosen alarm sound can lose its waking effectiveness through habituation — the brain’s tendency to reduce its response to repeated, predictable stimuli. This is the same process described in alarm fatigue. Switching sounds every two to three weeks maintains novelty response without requiring a dramatic change.
5. Don’t compensate with volume
Turning your alarm up very loud increases the harshness of the wake transition without reliably improving waking. If you’re sleeping through your alarm, the issue is almost certainly sleep debt or alarm placement, not insufficient decibels. An alarm across the room at moderate volume with melodic structure will outperform a maximum-volume beep at arm’s reach.
One limitation: the RMIT study relied on self-reported sleep inertia rather than objective cognitive testing, so the effect sizes should be interpreted with caution. The direction of the evidence is clear — melodic and graduated over harsh and abrupt. The precise magnitude of benefit is still being established.
What is the best alarm sound for waking up? Research from RMIT University (McFadyen et al., 2020, PLOS ONE) found that melodic alarm sounds — with clear harmonic or ascending tonal structure — were associated with lower sleep inertia scores than harsh, non-melodic alarms. The optimal alarm is melodic, uses gradual volume increase, has no strong prior emotional associations, and is rotated every few weeks to prevent habituation.