Damn. The type is over-the-top, but the layout is so simple. I wonder if there was a phototype font that had all these amazing ligatures, or if she did it manually. Either way—good stuff.
Yes, these are prefabricated letters! Not from a phototype font, though, but from a dry-transfer sheet. The multiline letterforms used for The Functions of Sleep are from Stripes. This Letraset typeface was designed by Tony Wenman in 1972 and included all the glyphs shown here (see below). The lines of the initial and final letters were extended to appear as if they wrap around the book cover. The only other example of such a treatment that I’m aware of is the cover of Letraset USA’s Graphic Art Products Catalog, also from 1973.
Cover designer unknown. Sally Sullivan — who worked as a designer for Yale University Press — is credited for the book interior (not shown here).