Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answer updated 3 months ago

1.Your Night Prayer (Salat Al-Layl) is valid even if time of Fajr starts while you are still praying Night Prayer.

2.Night Prayer can be performed as Qadha and it is recommended for those who missed it to perform it as Qadha any time during day or night.

3. Last verse of Sura Al-Kahf has been mentioned in our books to be recited to wake up easily قُلْ إِنَّمَا أَنَا بَشَرٌ مِّثْلُكُمْ يُوحَىٰ إِلَيَّ أَنَّمَا إِلَٰهُكُمْ إِلَٰهٌ وَاحِدٌ ۖ فَمَن كَانَ يَرْجُو لِقَاءَ رَبِّهِ فَلْيَعْمَلْ عَمَلًا صَالِحًا وَلَا يُشْرِكْ بِعِبَادَةِ رَبِّهِ أَحَدًا
الكهف ١٨ | الآية: ١١٠]Sura 18, verse 110.

Wassalam.