Zulfadlin Zaakiru Ibn Kafidubu writes ;
BISMILLAH RAHMANIR RAHEEM
Certainly, all the gratitude is due to Allah, the Lord and the Sustainer of the Universe, who raised the ferment without pillars in its stand and stretched out the ground as though a bed. We seek His refuge from the evil of our own actions. Indeed! There is none to worship except Allah and our Beloved Muhammad is His Messenger. May the peace and Blessings of Allah be enshrouded unto Him, his household and Companions, which will endure until the Day of certainty, Amin.
In observing our Fasting, there are two important things we should know and consider in order to have a complete and valid Fasting; the Dawn-meal (Sahur) and Iftar(Breaking of fast). However, in this article, We will be discussing the dawn-meal only, and in the will of Allah, the Iftar would come in a different episode. Most of us Muslims see not the relevance of taken the dawn-meal, Arabically; “Sahur” in their Fasting. In fact, some even see it as a weakness to take the meal since they regard it as a way of showcasing their endurance in the long hours of Fasting. We need to know more about Dawn-meal!
Mankind has always sought wisdom but was misguided following his desires. Taking the Sahur meal is one of the Prophetic traditions in Fasting. The Prophet of Allah ﷺ used to encourage his Sahaba to take the Dawn-meal in their Fasting. He never encouraged Fasting On an empty meal, what is most recognized as “dry-Fasting”. On one occasion he offered his Fasting and continued the next day without taking any meal between, the companions were inspired by the endurance and they also tried to do same but to their failure, they suffered a lot on that day and so he stopped them indulging into such an action. He said: “I am not like you, in my circumstance I’m being fed food and drink.” 
In another narration, the Messenger of Allah ﷺ gave rather clear advice on the need to take “Sahur”, he said: “take Sahur, for there are many blessings in it.”
THE SPECIFIC TIME FOR TAKING THE DAWN MEAL
In order to perfect our Fasting and render it acceptable, plus enjoying every bit of benefit that is contained in it, we need to pay heed to the conditions and laws governing the Fasting. The meal has no specific time for beginning but it does have for ending or closure. When one feeds beyond the limit, i.e. the stated time for ending the meal, the fasting is crippled and to an extent the Fasting is invalid. Allah grants us understanding and perfection in our fasting, Amin!
Let’s also at this point be keenly attuned to the saying of Allah Ta’ala: “…and eat and drink until the white thread of dawn appears to you distinct from the black thread, then complete your Sawm (fasting) till night falls”. 
UNDERSTANDING OF TERMINOLOGIES
One might get perplexed upon seeing this saying: “eat and drink until the white thread of dawn appears to you from the black thread”, do I need to get these threads and always measure my meal closure? It would have been a difficult task to do. One of the companions of our Beloved Muhammad ﷺ asked upon the descending of the verse whether he needs to get the two threads and always use it to measure, then the Prophet ﷺ responded to him saying: “the actual meaning of it is; the darkness of the night (black thread) and the brightness of the day is also the (white thread).”
In the limited understanding of some Sahaba (Companions) at the beginning, they used to even tire a white and a black thread alternatively on their legs whenever they wake up to take their Dawn-meal. The person eats and drinks until he can clearly distinguish the two threads tired to the legs. They continued indulging into such until Allah made it very clear in the completion of the verse; “of the dawn”, then they realized fully that the darkness of the night is the (black thread) and the brightness of the day is as well the (white thread). 
DELAYING THE DAWN-MEAL (SAHUR)
Though we have stated earlier that the Dawn-meal has no specific time for beginning, yes, it’s still the same! But it does have a suitable time. The companions of our Beloved Messenger ﷺ are good examples for us to imitate for they have had firsthand knowledge and experience, living with the Prophet and learning from him. The Qur’an says: “…be you (the companions) Rabbaniyyun (role models) because you have been teaching the Book (the Qur’an) and you are studying it”.