وَٱلَّيْلِ إِذَا يَغْشَىٰهَا 
  Wa a llayli i tha  yaghsh a h a      and the night as it veils it darkly!
   - Mohammad Asad
     
by the night, which draws a veil over it;
   - Muhammad Farooq-i-Azam Malik
   and the night as it conceals it!
   - Mustafa Khattab
     
And the night when it enshroudeth him,
   - Marmaduke Pickthall
   By the Night as it conceals it;
   - Abdullah Yusuf Ali