نعس

نَعْسَةٌ ذ [ 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.)