Lexical Definition
Strong's Greek G2518
to lie down to rest, i.e. (by implication) to fall asleep (literally or figuratively)
KJV usage: :--(be a-)sleep.
Etymology: from and (to sleep);
Thayer's Greek Lexicon
to sleep, be fast asleep, Mt. 8:24; 9:24; met. to sleep in spiritual sloth, Eph. 5:14; 1 Thess. 5:6; to sleep the sleep of death, to die, 1 Thess. 5:10
Key Appearances in the New Testament
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