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.)