Found 4 Strong's definitions.

1. 1

   G3573: νυστάζω (nystázō)

   from a presumed derivative of νεύω; to nod, i.e. (by implication) to fall asleep; figuratively, to delay:--slumber.

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2. 2

   G2518: καθεύδω (katheúdō)

   from κατά and (to sleep); to lie down to rest, i.e. (by implication) to fall asleep (literally or figuratively):--(be a-)sleep.

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3. 3

   G2837: κοιμάω (koimáō)

   from κεῖμαι; to put to sleep, i.e. (passively or reflexively) to slumber; figuratively, to decease:--(be a-, fall a-, fall on) sleep, be dead.

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4. 4

   G1127: γρηγορεύω (grēgoreúō)

   from ἐγείρω; to keep awake, i.e. watch (literally or figuratively):--be vigilant, wake, (be) watch(-ful).

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