συννοεῖν
From LSJ
ὕπνος δεινὸν ἀνθρώποις κακόν → sleep is a terrible evil for humans (Menander, Sententiae monostichoi 1.523)
Greek > English (Woodhouse Verbs Reversed)
(see also συννοέω): ponder, reflect, brood on, contemplate mentally, cudgel one's brains, meditate on, ponder on, rack one's brains, reflect on, reflect upon, take into consideration, think of, wrack one's brains