How to Wake Up for Fajr When the Time Keeps Changing

To wake up for Fajr reliably, set your alarm from your own mosque's timetable, not from a fixed time, and move it every week. Fajr begins at dawn and ends at sunrise, so its clock time moves every day. In the UK it moves a lot: in Birmingham, one observation-based timetable puts it at about 2:30am in June and 6:45am in December.

A fixed 5am alarm will be hours too late in summer and needlessly early in winter. What works is a wake-up time that follows the timetable, a bedtime set from that wake-up time, and something loud enough to get you out of bed.

What time is Fajr, and why does it keep changing?

Fajr starts with the first spread of light along the eastern horizon before sunrise, and, in the words of one definition quoted in the OpenFajr research paper, "This time ends with sunrise." Because dawn and sunrise shift through the year, so does Fajr. The further you live from the equator, the bigger the swing.

The OpenFajr project in Birmingham photographed the sky every minute for a year with an astronomy camera, and a panel of scholars and researchers used the images to produce a timetable. Its times, published in GMT, converted here to UK clock time:

Date	OpenFajr Fajr time (Birmingham)	On the clock (UK)
18 January	06:41 GMT	6:41am
18 March	04:48 GMT	4:48am
18 April	03:22 GMT	4:22am BST
18 May	02:14 GMT	3:14am BST
18 June	01:30 GMT	2:30am BST
18 August	03:08 GMT	4:08am BST
18 October	05:11 GMT	6:11am BST
18 December	06:45 GMT	6:45am

From mid-June to mid-December, that is a difference of more than four hours on the clock. Your local timetable will differ, but the pattern is the same anywhere in the UK.

Why do mosque timetables give different Fajr times?

There is agreement on what Fajr is, but not on how to calculate it. The OpenFajr paper describes the main approaches communities use: a fixed angle of the sun below the horizon, a fixed time before sunrise, a share of the night ("typically into seven, with fajr one-seventh the night prior to sunrise"), or a mix of these at higher latitudes. When the study was done, it found most organisations in Birmingham published Fajr at a fixed 1 hour 40 minutes (or similar) before sunrise.

The differences are largest in summer. The paper found "35 minutes between the OpenFajr timetable and Birmingham Central Mosque's timetable in June", and notes "there is greatest variance of timetables in the summer months." In its own observations, the sun was between about 12.3 and 15 degrees below the horizon at Fajr, depending on the date.

This guide does not take a side. The practical point is simple: pick the timetable your mosque or community follows, and set your alarm from that, not from a generic app default.

How much does Fajr move in a week?

Enough to make a weekly update worthwhile. At East London Mosque, Fajr begins at 5:35am on 4 October 2026 and at 5:43am on 10 October, eight minutes later in six days. Jamaat on 4 October is at 5:55am and sunrise at 7:03am.

Around the spring, the change runs the other way and faster. In the OpenFajr timetable, Fajr moves from 03:22 GMT on 18 April to 02:14 GMT on 18 May, more than an hour earlier in a month. An alarm set in mid-April will be over an hour late by mid-May.

What happens to Fajr when the clocks go back?

It jumps an hour earlier on the clock overnight. In the UK the clocks go back at 2am on Sunday 25 October 2026. Using the OpenFajr times:

• Saturday 24 October: Fajr at 05:22 GMT, which is 6:22am on the clock (BST).
• Sunday 25 October: Fajr at 05:24 GMT, which is 5:24am on the clock (GMT).

If your alarm is set for 6:10am on the Saturday and you leave it there, on the Sunday you will wake after Fajr has begun and closer to sunrise than you intend. Move it back by an hour that night. In most of the US, the same jump happens on Sunday 1 November 2026. Our post on when the clocks go back in 2026 has the dates and sleep tips.

How do I wake up for Fajr every day?

1. Work back from the time that matters to you. If you pray at home, that is the start of Fajr. If you attend jamaat, it is the jamaat time, minus wudu and travel.
2. Update your wake-up time once a week. Every Sunday evening, check the coming week on your mosque's timetable and set the earliest time, or adjust day by day.
3. Set bedtime from wake-up time. The CDC recommends 7 or more hours of sleep a night for adults aged 18 to 60. A 5:15am wake-up means asleep by about 10:15pm. In June, with Fajr around 2:30am in Birmingham, that is not realistic for most people, so plan the night deliberately rather than hoping to manage on very little sleep.
4. Keep the rest of the routine steady. The CDC's advice is "Going to bed and getting up at the same time every day" and "Turning off electronic devices at least 30 minutes before bedtime." Fajr makes the first one hard; consistency on the second helps.
5. Put the alarm out of reach, and use more than one. An alarm you can silence without moving is easy to sleep through.
6. Have someone wake you. People have long relied on others for this. The OpenFajr site quotes a hadith in Sahih al-Bukhari in which the Prophet explains that Bilal "pronounces the Adhan at night, so that the one offering the late night prayer (Tahajjud) from among you might hurry up and the sleeping from among you might wake up." A family member, a friend at the mosque, or a phone call can do a similar job.

How ReminderIt can help

ReminderIt places a real phone call at the exact time you choose, in a natural voice that reads your message, such as "Fajr starts at 5:35. Time to get up for wudu." Because it is a call, you have to pick up or decline it, which takes more effort than tapping snooze. If you miss the call, you get a WhatsApp message.

You can set it by sending a WhatsApp message (text, voice note or photo), for example "Call me at 5:15 every morning this week", or on the website, and there is no app to install. Fajr moves, so update the time each week from your timetable. You can also set a wake-up call for a family member, such as a teenager or a parent; they confirm first.

There is a 7-day free trial with 7 free reminder calls (3 if your number is in a country where calls cost more). After that it is one plan: $7 a month, or ₹299 a month in India, with annual and 2-year options.

The short answer

Fajr runs from dawn to sunrise, and in the UK its clock time moves by more than four hours across the year, from about 2:30am in June to 6:45am in December in Birmingham's OpenFajr timetable. Set your alarm from your own mosque's timetable, update it every week, move it back an hour when the clocks change on 25 October, and set your bedtime from your wake-up time. A wake-up method you cannot ignore, whether a person or a call, makes the rest easier.

Sources: OpenFajr Research Project, OpenFajr Research Project paper (May 2016) and openfajr.org; East London Mosque prayer timetable (via Masjidbox), October 2026; CDC, About Sleep.