שָׁקַד shâqad (H8245)

to be alert, i.e. sleepless; hence to be on the lookout (whether for good or ill)

1) to wake, watch, awake, be alert 1a) (Qal) 1a1) to keep watch of, be wakeful over 1a2) to be wakeful, wake (as mourner or sufferer)

a primitive root;