1. a person who nods their head, especially frequently or habitually
Usage: informal
2. a person who falls asleep, especially while sitting up
Usage: informal

Examples

• The professor noticed several nodders in the back row during his lecture.
• She’s always been a nodder during meetings, showing her agreement.
• The long train ride turned many passengers into nodders.
• He became a nodder whenever he tried to read late at night.
• The warm classroom made him a nodder despite his best efforts to stay alert.