לַיִל layil (H3915)

properly, a twist (away of the light), i.e. night; figuratively, adversity

1) night 1a) night (as opposed to day) 1b) of gloom, protective shadow (fig.)

or (Isaiah 21:11) לֵיל; also לַיְלָה; from the same as לוּל (H3883);