What is the ruling on the muezzin's statement, "Prayer is better than sleep," in the Fajr adhan, given that all workers are awake at this time?

The "Thawb" (call to prayer phrase) in the Fajr (Dawn) prayer's Adhan (call to prayer), which is "Prayer is better than sleep," is sunnah (recommended) and sound, as indicated by authentic hadiths. It is a sunnah, so if the muezzin (caller to prayer) omits it, his adhan remains valid, but he misses out on the virtue. The wisdom behind its legislating for the Fajr prayer is that its time is often when people are asleep, so they need to be alerted with this phrase. The legitimacy of the thawb is general and not limited to the situation where people are asleep.