Answered by Sayyidi Habib Umar bin Hafiz (may Allah protect him and benefit us by him)
What can I do if I cannot get up for Fajr?
Make a firm resolve to do so, strive to your utmost ability to do so and seek Allah’s aid.
What can I do to help me wake up for prayer at night?
You must be persistent and make use of both outward and inward means to help you wake up. Outward means include the use of an alarm clock, or making an agreement with a friend to wake you up, whether locally, or someone that calls you.
Inward means include making Istighfar (seeking forgiveness) just before dawn and just before sunset, and giving life to the time between Maghrib and Isha by engaging in acts of goodness.
Before sleeping you should recite:
The tasbih that the Prophet (peace be upon him) taught to his daughter Sayyidah Fatimah al-Zahra and Sayyiduna Ali ibn Abu Talib.:
Subhan Allah (transcendent is Allah) 33 times, Alhamdulillah (all praise be to Allah) 33 times and Allahu Akbar (Allah is most great) 34 times.
The last four verses of Surat al-Kahf (18: 107-110):