From a presumed derivative of neuo; to nod, i.e. (by implication) to fall asleep; figuratively, to delay -- slumber.
see GREEK neuo
1. properly, "to nod in sleep, to sleep (Hippocrates, Aristophanes, Xenophon, Plato, others); to be overcome or oppressed with sleep; to fall asleep, drop off to sleep," ((cf. Wycliffe) to nap it"): Matthew 25:5; the Sept. for נִרְדַּם, Psalm 75:7 2. like the Latindormito (cf. our to be napping), tropical equivalent to: to be negligent, careless (Plato, Plutarch, others): of a thing equivalent to to linger, delay, 2 Peter 2:3.