نعس1 نَعَسَ, (S, A, Msb, K,) aor. ـُ (S, M, and so in a copy of the B by the author of the K,) or ـَ (A, K,) [the latter being agreeable with analogy,] inf. n. نُعَاسٌ, (S, A, K, * TA,) or this is a simple subst., (Msb,) [He drowsed; he was, or became, drowsy, or heavy with sleepiness: or he slumbered, or dozed:] the inf. n. is syn. with  وَسَنٌ: (S, A, K:) or ↓ نُعَاسٌ signifies languor in the senses, (K, TA,) arising from the heaviness [which is the prevenient sign] of sleep: (TA:) or the beginning of sleep: (M, art. وسن:) or its proper signification is, accord. to Az, (Msb, TA,) وَسَنٌ (Msb) or سِنَةٌ (TA) without sleep: (Msb, TA,) or سِنَةٌ is in the head, and نُعَاسٌ is in the eye: or سنة is the vapour (ريح) of sleep which begins in the face, then is transmitted to the heart, and you say, of a man, يَنْعَسُ, and then, يَنَامُ. (Msb, art. نوم.) It is said in a proverb, مَطْلٌ كَنُعَاسِ الكَلْبِ [A delaying of the payment, of a debt, or the like, like the drowsing, or slumbering, of the dog:] i. e. continual: (S, TA:) for the dog is characterized by much نعاس, and, as is said in the B, is accustomed to open his eyes [only] sufficiently for the purpose of guarding, and this he does time after time. (TA.) b2: نَعَسَ, (TK,) inf. n. نَعْسٌ, (IAar, K,) (assumed tropical:)  It (a man's judgment, and his body,) was soft, and weak. (IAar, K, TK.) b3:  (assumed tropical:)  It (a market) was, or became, stagnant, or dull, with respect to traffic. (K, TA.) 4 انعس (assumed tropical:)  He begat heavy, sluggish, lazy, indolent, or torpid, sons. (AA, K.) 6 تناعس He feigned himself [drowsing, or slumbering, or] sleeping. (K, * TA.) b2:  (tropical:)  It (lightning) became faint. (A, TA.) نَعْسَةٌ [A single fit of drowsiness: or of slumber:] a single movement of the head in drowsing or slumbering. (TA.) You say, رَكَبَتْهُ نَعْسَةٌ شَدِيدَةٌ [A vehement fit of drowsiness, or of slumber, came upon him]. (A.) And نَعَسْتُ نَعْسَةً وَاحِدَةً [I drowsed, or slumbered, once]. (S.) نَعْسَانٌ: see نَاعِسٌ.نُعَاسٌ: see 1.نَعُوسٌ A she-camel bountiful in yielding milk; (S, A, K;) that drowses, or slumbers, in yielding milk; (A;) or because, in yielding milk, she drowses, or slumbers: (S:) or having much milk, that drowses, or slumbers, when milked: (M:) or that closes her eyelid on being milked. (Az, TA.) نَعَّاسَةٌ: see نَاعِسٌ.نَاعِسٌ, part. n. of نَعَسَ, [Drowsing, drowsy, or heavy with sleep: or slumbering, or dozing:] (S, Msb, K:) as also ↓ نَعْسَانٌ; (Lth, Fr, Th, Msb, K;) but this latter is rare; (Fr, Th, Msb, K;) and by some disallowed: (TA:) fem. of the former with ة: (Msb, TA:) and of the latter نَعْسَى, made to accord. with وَسْنَى, fem. of وَسْنَانٌ; and this is best in poetry: (Lth, Msb, TA:) and ↓ نَعَّاسَةٌ is also used as an epithet [in an intensive sense] applied to a female: (TA:) the pl. of نَاعِسٌ is نُعَّسٌ; like رَكَّعٌ, pl. of رَاكِعٌ: and that of نَاعِسَةٌ is نَوَاعِسُ. (Msb.) b2:  جَدُّهُ نَاعِسٌ (tropical:)  [His good fortune is slumbering]. (A, TA.)