Answer:
(Fatwa: 1909/1538/B=1432)
It is not necessary to sleep between Isha and Tahajjud. If someone stays awake throughout night and performs Salah al-Tahajjud before dawn, it will also be called tahajjud. It is not right to term it as wrong.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
