Dream - Sahur is often interpreted as a way to fill up stamina to be able to fast, but in reality, many people can endure fasting without having sahur. However, a Muslim is encouraged to wake up and have sahur. This is because sahur distinguishes the fasting of the previous prophets' followers from the fasting of the followers of Prophet Muhammad SAW. As for the name Sahur, it is used because it is during the time of Sahar (سحر). The word sahar itself shares the same root as the word sihir, which means deception.

Quoting from Islami.co, Prof. M. Quraish Shihab explains that sahur (pre-dawn meal) is a special time. There is even a narration saying that Allah, along with His angels, send blessings and bestow mercy upon those who observe it. Such is the importance of sahur that the Prophet Muhammad advised to have it, even if it's just with a date or a sip of milk. Not only that, sahur time also has many virtues.