Composer and academic Milton Mermikides, speaking at Gresham College, argues that sleep and music share a structural kinship, both built from rhythm, repetition and phrasing that resist plain description. He traces the connection from ancient myths pairing music with sleep through Debussy's techniques for dreamlike sound and the cultural variation found in lullabies across different societies. Specific cases anchor the argument: Paul McCartney's Let It Be and Tartini's Devil's Trill Sonata, both melodies their composers reported receiving in dreams, and EEG waveforms recorded during sleep that Mermikides treats as a kind of unheard music. The lecture moves into current research turning sleep data directly into sound, and closes on music's role in creativity, mental health and recovery. Mermikides, a Surrey PhD and Berklee graduate who has worked with Brian Eno and Evelyn Glennie, keeps the talk grounded in concrete examples rather than abstraction, walking through named pieces, composers and clinical uses of music as it moves from folklore to laboratory.