Performing salaah After Isha with the Intention of Tahajjud salaah

Q: Salaah-709: A person is eager to perform the Tahajjud salaah but is unable to wake up from his sleep. Will he receive the reward of the Tahajjud salaah if he performs two or four Rakaahs salaah after the Isha salaah with the intention of Tahajjud salaah?

Answer: If the person in the stated case performs a few Rakaahs of Nafl salaah after the two Rakaahs Sunnah salaah, he will Inshaa Allaah have fulfilled the Sunnah of the Tahajjud salaah. And Allaah knows best what is most correct.

Fatawa Rahimiyyah vol.2