Niht-slǽp

According to the Old English Dictionary:

es;

niht-slǽp

m. Sleep during the night :-- Ðæt ilce geþanc ðe heom amang ðam nihtslǽpe wæs on heora heortan, eall ðá hí áwac. Odon hí ðæt sylfe geþohton, Homl. Skt. 23, 442. niht-slæp