AlarmiFex makes this page; we've tried to be fair.
A sunrise alarm wakes you with light that slowly brightens before your wake-up time. A sound alarm wakes you with noise at a set moment. Small studies suggest gradual light can make waking up feel easier, but it is not proven to wake a deep sleeper on its own, so a sound alarm you can clearly hear is the safer base, with light as an optional extra.
We make AlarmiFex, a sound alarm app, so we have a stake in this question. We have tried to be fair: this page says where light helps, where sound wins, and where the built-in options on your phone already do the job.
What is the difference between a sunrise alarm and a sound alarm?
A sunrise alarm, also called a dawn simulator or wake-up light, is a lamp (or a phone screen) that starts glowing softly before your alarm time and gets brighter over a set stretch, often somewhere between 15 and 30 minutes. The idea is to copy a sunrise, so your body gets a cue to lighten its sleep before you are fully woken. Some dedicated lamps also add a sound at the end as a backup, but the light is the point.
A sound alarm does the reverse. Nothing happens until the moment you chose, then a tone, song or voice starts and keeps going until you stop it. It works whether your eyes are open or shut, whether you face the phone or the wall, and whether the room is dark or already bright.
That difference in timing is the whole story. Light is a slow nudge that starts early. Sound is a firm call that arrives on time. Most people who wake easily with one would also be fine with the other; the gap shows up on the mornings you are tired, or if you sleep deeply.
AlarmiFex makes this page; we've tried to be fair.
Does a sunrise alarm actually work?
It may help some people feel more alert after waking, but the evidence is small and mixed, so treat it as a comfort tool rather than a guarantee. In one small study, eight people who found waking difficult were tested on two mornings, one with a simulated dawn during the last 30 minutes of sleep and one without. They rated their alertness higher, and did slightly better on some thinking and reaction tasks, after the dawn trial. Eight people is a very small group, so it shows an idea worth testing, not a result you can count on at home.
A later literature review on dusk and dawn light exposure at home found that most research on dawn simulation looked at the darker months of the year, usually with sunrise alarms, and that results may depend on things like age and chronotype (whether you are naturally a morning or evening person). Its authors noted that very little research has looked at this area so far.
Here is what that means in plain terms. Gradual light is a reasonable thing to try if you dislike being jolted awake. It is not a reason to drop your sound alarm. None of this research says light will wake someone who sleeps through noise.
Which is better for waking up: a sunrise alarm or a sound alarm?
For being awake at a set time, a sound alarm is better. For a gentler start, a sunrise alarm can add something a sound cannot. The table lays out the trade-offs.
| Sunrise alarm | Sound alarm | |
|---|---|---|
| How it wakes you | Light brightens over about 15 to 30 minutes | A tone, song or voice starts at your set time |
| Works with eyes closed? | Light is much dimmer with eyes closed | Yes, you hear it either way |
| Works if you are facing away? | Depends on where the light sits and how bright it is | Yes |
| Gentle start | Yes, by design | Only if the sound starts soft |
| Needs extra gear? | A lamp, or your phone screen | Your phone |
| Risk if you stay asleep | Nothing forces you awake unless a sound follows | Sound keeps going until you act |
| Variety | One kind of experience | Many tones, songs and voices to choose from |
Can your phone be a sunrise alarm?
On some Android phones, yes. Google's Clock app has a Sunrise alarm option that, per Google's Clock Help, slowly brightens your screen 15 minutes before your alarm starts. You turn it on in the settings for your wake-up alarm. Samsung and other makers use their own clock apps, so look in your alarm settings to see whether yours offers something similar.
On iPhone, we did not find a built-in sunrise or gradual-light option in the Clock app as of this writing. If you want one, you would need a separate lamp or app. Check Apple's current iPhone User Guide, since features change with each iOS release.
A phone screen is also a small, dim light source next to a dedicated lamp, and you have to leave it facing you, unlocked and on charge. If you put your phone across the room, which is a good habit and one we cover in where to put your phone at night, a screen glow may not reach your eyes at all. Keep a sound alarm as the thing you rely on.
When does a sound alarm win?
A sound alarm wins whenever the wake-up time is not negotiable, or the light might not reach you. Think of early flights, the first shift, an exam, a school run, or a hotel room with blackout curtains and a shared bed. Sound also wins when you sleep deeply, since a slow glow is easy to sleep through while a noise that keeps going is harder to ignore.
It also wins on flexibility. You can change a sound whenever you like, which matters because of habituation: the brain tunes out a sound it hears every morning. Our guide on why you sleep through your alarm goes through checking the basics first, and Wake-up Series explained shows how a few different sounds across a window can keep the alarm from fading into the background.
Do the built-in step first. Whatever phone you have, open the Clock app, pick a sound you can clearly hear, and set the ringer volume where you can hear it from bed. Then run a test alarm. If that does not work for you, an app is one more option. AlarmiFex is an alarm app for iPhone and Android with 34 sounds in five moods: Calm, Energetic, Motivational, Classic and Anime. You can preview a sound before you choose it, import your own audio or video clip, including a voice memo, and trim it to a minute or less with custom alarm sounds. Browse the mood-based sound library if you want something softer or something with more energy. On iPhone, alarms use Apple's AlarmKit, so they can ring with the app closed, the phone locked, on silent or in Focus once you allow alarms. AlarmiFex is free to download.
Can you use both a sunrise alarm and a sound alarm?
Yes, and for many people this is the best answer. Use light for the gentle lead-in and a sound for the firm deadline. Here is a simple way to set it up:
- Set your sound alarm for the time you must be up. Treat that as the deadline.
- If your phone or lamp has a sunrise mode, set it to start 15 to 30 minutes earlier, and place the light where it faces you.
- Pick a sound that starts soft but does not stay soft. A calm tone is nice for the lead-in; a more energetic one suits the deadline.
- If you want several sounds across the window, Wake-up Series in AlarmiFex lets you choose a time window and at least two different sounds that play across it. It is sound-based, not light-based, so it pairs with a lamp rather than replacing one.
- Test the whole setup once before you depend on it.
If you share a room, a gradual light may also be easier on a partner than a full-volume alarm, though a light that wakes you but not them is not guaranteed either. Talk it through and try it for a week.
How do you choose between them?
Start with what is going wrong. If your problem is that waking up feels harsh, light is worth a try. If your problem is that you do not wake up, work on the sound and the basics first.
- Dread being jolted awake: try a sunrise setting plus a sound that starts soft.
- Sleep through alarms: choose a sound you notice and rotate it. See alarm tips for heavy sleepers and how to wake up a heavy sleeper.
- Phone on silent: make sure your alarm still rings. See how AlarmiFex rings on silent on iPhone.
- Hard time getting out of bed: light will not get you up. Read alarms that get you out of bed.
Sleep habits matter more than either gadget. The American Academy of Sleep Medicine recommends getting up at the same time every day, even on weekends, and the NHS suggests a quiet, dark, cool bedroom and fully closed curtains to keep the room dark. Those basics set up both light and sound alarms to work.
This is general information, not medical advice. If you feel very sleepy through the day, snore loudly, or struggle with low mood in winter, talk to a doctor or other clinician. A sunrise alarm is not a treatment for any condition.
Quick answers
A sunrise alarm, also called a dawn simulator or wake-up light, slowly brightens a lamp or screen before your alarm time to copy a sunrise. Many models add a sound at the end as a backup.
Not for waking at a firm time. Small studies suggest gradual light may make waking feel easier, but a sound keeps going until you act, so it is the safer base. Many people use light for a gentler start and a sound for the deadline.
We did not find a built-in sunrise or gradual-light option in the iPhone Clock app as of this writing. On Android, Google's Clock app has a Sunrise alarm option that brightens your screen 15 minutes before the alarm. Check your phone's current settings.
There is no good evidence that it will on its own. Research so far is small and mixed. If you sleep through alarms, pick a sound you notice, keep the ringer volume up, and test your setup before bed.
Free to download. Premium sounds and custom sounds need a subscription. See current pricing and terms in the app.