"I Had Too Much to Dream (Last Night)" is a song written by Annette Tucker and Nancie Mantz, which was recorded in late 1966 by the garage rock band, The Electric Prunes. Released as the band's second single, it reached # 11 on the Billboard Hot 100 and # 49 in the UK in 1967.

It was also the lead track of the band's debut album, and became more widely known as the opening track on the influential Nuggets compilation of garage rock and early psychedelic music, released in 1972.

The song describes a man who is suffering from symptoms of a hangover after having an affair with his lover, claiming he had "too much to dream" the previous night. This title is a pun on having "too much to drink" (as in, having too many alcoholic beverages), hence the hangover.

The Electric Prunes originally formed as The Sanctions at Taft High School in Los Angeles, renaming themselves in 1966. They were introduced to record producer Dave Hassinger, and after a series of rehearsals at Leon Russell's house released a debut single, "Ain't It Hard". Despite its commercial failure, Reprise Records agreed that the band could record a second single.

Convinced that the band could not write their own songs, Hassinger sought material from the professional songwriting team of Annette Tucker and lyricist Nancie Mantz. One of the tunes was "I Had Too Much to Dream (Last Night)", a song that, according to some sources, was originally conceived as an orchestral piano ballad. However, according to Tucker, "I came up with the title one day and called Nancie. She loved it and we wrote it the next day in one half hour....The words were there and my melody came easily. I was influenced by the Rolling Stones at the time and that is how I heard that song being recorded....Nancie and I envisioned this as a rock song." A demo version recorded for Hassinger by singer-songwriter Jerry Fuller (in some sources wrongly identified as Jerry Vale), may have been the source of the story of the song's origin as a ballad.

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