Why does the Fajr adhan say prayer is better than sleep?

The Fajr adhan adds "As-salatu khairun min an-nawm" (prayer is better than sleep) because it is the only call that comes while most people are asleep. It is a gentle wake-up line taught in the time of the Prophet ﷺ, reminding you that a few minutes with Allah are worth more than a few more minutes in bed.
What the phrase is and where it comes from
In the dawn adhan, after "Hayya 'ala al-falah" (come to success), the caller says "As-salatu khairun min an-nawm" twice. The Prophet ﷺ taught the adhan to Abu Mahdhurah and told him that for the Fajr prayer he should add this line (Sunan Abi Dawud 500). Scholars call it tathwib, from a root meaning "to return" or "to call again", because it repeats the invitation in a new way. All four Sunni schools (Hanafi, Maliki, Shafi'i, Hanbali) agree it belongs to the Fajr adhan only. It is not said at Dhuhr, Asr, Maghrib or Isha, because at those times people are already awake.
Why "better than sleep" is true
Sleep is a blessing, not something bad. The phrase doesn't insult rest; it compares two good things and tells you which one wins at that moment. Allah gives the dawn prayer special weight:
Scholars explain "witnessed" as the angels of the night and the angels of the day both being present at Fajr. The Prophet ﷺ also said the two short sunnah rak'ahs before Fajr are better than the world and everything in it (Sahih Muslim 725). If those two rak'ahs beat the whole world, the obligatory prayer is certainly worth leaving a warm bed for.
How you answer it
When you hear the adhan, you repeat each phrase after the caller. For this line, most scholars say you simply repeat it: "As-salatu khairun min an-nawm." Some scholars mention saying "Sadaqta wa bararta" (you have spoken the truth and done well), but there is no authentic hadith for that wording, so repeating the phrase is the safer choice.
Help for the sleepy convert
Getting up for Fajr is the hardest habit for many new Muslims, especially in a northern European summer when dawn comes very early. The Prophet ﷺ said that Satan ties three knots at the back of a sleeper's head; remembering Allah when you wake unties one, wudu unties the second, and prayer unties the third (Sahih al-Bukhari 1142).
- Go to bed earlier and keep the alarm across the room.
- Say the waking-up dua as soon as your eyes open. See What should I say when I wake up?
- Use a reliable prayer app with a Fajr adhan alarm. See Can I trust prayer time apps?
- After Fajr you can go back to sleep if your day allows it. See Can I still sleep in on weekends as a Muslim?
- "Prayer is better than sleep" is said only in the Fajr adhan.
- The Prophet ﷺ taught it to Abu Mahdhurah.
- The dawn prayer is "witnessed" (Quran 17:78).
- When you hear it, repeat the same words.
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