Green’s Dictionary of Slang

1. the head [SE nod].

1956		‘Charles Raven’ Und. Nights 200: Bounce off the Governor’s nodder.
2011		J.J. Connolly Viva La Madness 287: Sort the nodder out latwer. You have to be a bit sociopathic, sometimes.

2. a sleeper.

1958

D. Burley N.Y. Amsterdam News 22 Mar. 13: [She] rushe to the nodder with a basket of fodder.

3. (drugs) one who becomes comatose immediately following a narcotic injection; thus a narcotics addict (see cit. 1986) [nod v. (2)].

1979		B. Gutcheon New Girls (1982) 225: Restless junkies scratching themselves and looking to score, and others who had aready done so, nodding peacefully on the benches. These nodders didn’t stir when the summer wind tipped the high-soaring jet from the fountain in their direction.
1986		S. King It (1987) 200: The story was stupid, of course, but if it kept the speed-freaks and nodders away, it was at least a useful stupid story.
1995		J. Stahl Permanent Midnight 74: I was never much a nodder, and the dope high perked me up.