Yesterday

In 1964, Paul McCartney composed the song "Yesterday" which became the most covered song in history. The amazing thing about this is that he came up with the melody while dreaming.

'I was living in a little flat at the top of a house and I had a piano by my bed. I woke up one morning with a tune in my head and I thought, ‘Hey, I don’t know this tune — or do I?’ It was like a jazz melody.... I went to the piano and found the chords to it, made sure I remembered it and then hawked it round to all my friends, asking what it was: ‘Do you know this? It’s a good little tune, but I couldn’t have written it because I dreamt it.’

Paul McCartney

Google

In 2001 Larry Page (co-founder of Google) was struck by a vision in his dreams. In the dream, he managed to download the entire internet, which later became the foundation for Google.

"I spent the middle of that night scribbling out the details and convincing myself it would work."

Larry Page

Sources:

Huffington Post

Business Insider