"Sundown Syndrome" is a song by Tame Impala, released as a single in 2009. It was the band's first official single release. Its B-side was a cover of the Blue Boy song "Remember Me". The title "Sundown Syndrome" refers to a psychological phenomenon called Sundowning.

"Sundown Syndrome" was written by Kevin Parker in the key of E major in a mostly 6/8 time signature. It is based around the repeating chords of F♯m7 and G♯m7.

The song begins in 4/4 with the two above mentioned chords, while the drums are loose and jazzy and have flange added to them. It then changes to 6/8 time with a looser strumming pattern.

The verse comes soon after, with basic strums of the chords and occasional fills played on electric guitar. A kazoo then comes in, which some people mistook for a fuzz guitar, to play a solo in the E major scale over the same F♯m7, G♯m7 chord progression.

Another verse featuring the same previous structure, and another kazoo solo in the same E major scale return again. This gives way to a chorus using the barre chord progression of D flat major, G flat major, E major, B major, G flat major and D flat major. The chorus is in 6/8 time, but switches to one bar of 4/4 at the end of every chord progression, and four bars of 4/4 at the end of every chorus. Parker's vocals are heavily reverbed and delayed to give it a spacy atmosphere.

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