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The all-day event serves as a way to celebrate both Baker’s birthday and his legacy.

There's a dog park for owners to walk their pooches which "bark at 2, 3, 4, 5am" and the courtyard is a public space that is used for everything from children's birthday parties to all-day concerts finished off with fireworks.

Following his death fans gathered at the nearby Strawberry Fields memorial in Central Park for an all-day vigil, with musicians playing Lennon's songs while the crowd sang along.

The privately held company declined to share financial figures, but said its all-day cafes take up roughly 30% of floor space and serve 100,000 customers every week.

"Indeed, many all-day drinkers suffer from sleep disturbances," he explained, adding that "in this context, it is of interest that coffee seems to suppress melatonin, an important sleep-inducing mediator in the brain."