καθευδητέον
From LSJ
Οὐκ ἔστιν ἀγαθὸν ἐν ἀνθρώπῳ ὃ φάγεται καὶ ὃ πίεται καὶ ὃ δείξει τῇ ψυχῇ αὐτοῦ ἀγαθὸν ἐν μόχθῳ αὐτοῦ (Ecclesiastes 2:24, LXX version) → What is good in a human is not what he eats and drinks and shows off to his soul as a benefit of his labor
English (LSJ)
A one must sleep, Pl.Phdr.259d.
Greek (Liddell-Scott)
καθευδητέον: ῥημ. ἐπίθ., δεῖ καθεύδειν, Πλάτ. Φαῖδρ. 259D.
Greek Monotonic
καθευδητέον: ρημ. επίθ., αυτό που πρέπει να αποκοιμηθεί, σε Πλάτ.
Dutch (Woordenboekgrieks.nl)
καθευδητέον, adj. verb. van καθεύδω, er moet geslapen worden.