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The Beatles song Yesterday by Lennon/McCartney or McCartney/Lennon demonstrates perfectly how acting on a dream can create a legacy.

It is one of those charmingly beautiful songs that everyone knows and most would struggle not to sing along with. Its dreamlike quality is probably due to the fact that Paul woke up with the tune in his head one morning whilst staying at actress Jane Asher's house in Wimpole Street, London. And the reason that its creation is so powerfully relevant to the 90-minute principle is all to do with REM – and we're not talking about the band.

The REM or rapid eye movement section of our sleep patterns is the period in which ...

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