To set an alarm for a long-haul flight, decide whether you're timing a nap or waking before landing, then use a timer for short sleeps and an alarm for a clock time. For trips across time zones, check the time-zone converter first so you set the alarm to the right destination time.
Key points
- Use a timer for naps ("wake me in 90 minutes") and an alarm for a set time.
- Check arrival time in your destination zone with the time-zone converter.
- Plug in headphones so the alarm wakes only you, not the whole cabin.
- Keep the device awake and the tab open, or the alarm can't ring.
- Start living on destination time before you land to beat jet lag.
Nap timer or clock alarm - Pick the right tool
These are two different jobs, so use the right tool for each:
- A timer counts a length. "Wake me in 2 hours" is a timer job - Perfect for a nap when you don't care about the exact clock time.
- An alarm rings at a set time. "Wake me at 6:00 a.m. destination time" is an alarm job - Perfect for waking before you land.
Most flyers use both on one trip. A nap timer mid-flight, then an alarm timed to the meal service or descent.
Set a nap timer mid-flight in 4 steps
For a clean nap that doesn't wreck your sleep cycle:
- Open the timer in your browser.
- Enter your nap length - A 90-minute timer lets you finish a full sleep cycle.
- Plug in headphones so only you hear the alarm.
- Press start, set the device where the screen won't sleep, and rest.
Why 90 minutes? Waking at the end of a sleep cycle leaves you less groggy than waking in the middle of one. If you do wake up foggy, what is sleep inertia and how do you overcome it explains the heavy feeling and how to shake it.
Set an alarm for the right time zone
This is where long-haul trips trip people up. Your device may still show home time, but you want to wake on destination time. So convert first.
- Open the time-zone converter and check what your wake-up time is back home.
- Set the alarm to that converted home-clock time - For example, a 6:00 AM alarm in the right zone.
- Glance at the world clock to confirm the hour at your destination looks right.
Quick example: a 6:00 a.m. landing in Tokyo might be the middle of the night where you started. Set the alarm to whatever your device's clock reads at that moment, and the converter does the math for you.
| Tool | Use it for |
|---|---|
| Timer | "Wake me in 90 minutes" naps |
| Alarm | "Wake me at 6 a.m. destination time" |
| Time-zone converter | Turning destination time into your device's time |
| World clock | A quick gut-check of the hour at your destination |
Beat jet lag by waking on destination time
The simplest jet-lag trick is to start living on the new time zone before you arrive. Once you board, set your sleeps and wake-ups around destination time, not home time. The alarm and the time-zone converter together make that easy to plan. If you fly often, how to set an alarm for a different time zone goes deeper on the zone math.
Keep the alarm working on a plane
A browser alarm needs the tab open and the device awake to ring. On a flight that means a little care:
- Headphones in. No one wants your buzzer at 35,000 feet, and it wakes only you.
- Stop the screen from sleeping. A battery-saving sleep will silence the alarm. Keep the device active, or plug into a seat outlet if there is one.
- Don't mute the tab. A muted tab counts down silently and never rings.
- Airplane mode is fine. The alarm runs locally - It doesn't need internet once the page is loaded.
That last point matters. You don't need Wi-Fi for the alarm to fire, since everything runs in the browser on your device.
TL;DR
Use a timer for naps and an alarm for a set wake-up, and check the time-zone converter so you set it to destination time, not home time. Plug in headphones, keep the device awake and the tab open and unmuted, and the alarm runs fine in airplane mode since it works offline.