nawaafil

Tahajjud Salaah

Q: It is mentioned in the Hadith that Voluntary Worship is a means of attaining proximity to Allah. Besides the Obligatory and Essential Prayers, the Holy Prophet (Sallallahu Alayhi Wasallam) used to make arrangements for the Voluntary (Nawafil) Prayers too.

1) I want to perform tahajjud namaz daily but when I sleep I don't wake up at the time of tahajjud. So can I just offer eight rakats Voluntary Worship for Allah before going to sleep daily?

2) Is it allowed to perform extra Voluntary Worship any time of a day and any time of night before going to sleep?