Francis Crick is best known for the discovery of DNA, but he and Mitchison also published an early paper in the role of dreaming in 'unlearning' in the same issue of Nature as Hopfield, John et al published an account of nearal network unlearning.
Used on Chap. 22: page 543
Links:
crick.ac.uk: About Dr Francis Crick (at The Francis Crick Institute)- nature.com: The function of dream sleep