Praise be to Allah, the Lord of the Worlds; and may His blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
Fajr prayer is of great importance in the sight of Allah, as well as all other obligatory prayers. Allah says: " Perform As-Salat (Iqamât-as salat) from mid-day till the darkness of the night (i.e. the Zuhr, 'Asr, Maghrib, and 'Isha' prayers), and recite the Qur'an in the early dawn (i.e. the Morning Prayer). Verily, the recitation of the Qur'an in the early dawn is ever witnessed (attended by the angels in charge of mankind of the day and the night)" (Al-Isra 17:78), i.e. it is witnessed by the angels of the night and the angels of the day.
The Prophet (Sallallahu Alaihi wa Sallam) said: "Congregational prayers are 25 times better than individual prayers, and the angels of the night and those of the day meet at Fajr prayer." Reported by Al-Bukhari.
What also proves that Fajr prayer is important is that the prophet considered missing Fajr prayer in congregation a sign of hypocrisy.
The Prophet (Sallallahu Alaihi wa Sallam) said: "There is no prayers more difficult for hypocrites (to perform) than al-Fajr and al-Isha. But had they known what is in them (the great reward of these prayers) they would have come to them (these two prayers) even crawling (if they cannot walk)." Reported by Al- Bukhari.
So Fajr prayer is of great importance and you have to take the following means to wake up to perform it on time:
1. To sleep early.
2. To recite the remembrance of Allah when going to bed, and to sleep after performing a Wudu.
3. To set the alarm clock on the appropriate time.
4. To ask a person who prays Fajr on time to wake you up, either a member of your family or a friend by telephoning you.
5. Not to get exhausted by doing hard work.
6. To supplicate Allah as much as you can to enable you to wake up on time.
If you take all the above measures, you will InshaAllah wake up and pray on time.
Allah knows best.