Calvin Harris fell asleep waiting for Rihanna to record 'This is What You Came For'.

The 32-year-old Scottish DJ has revealed he jetted over to New York to meet with the Barbados-born singer and to ensure she would join him and record the vocals for their latest collaboration, although he dozed off in a hotel waiting for the 28 year old to arrive.

Speaking on Zane Lowe's Apple Music Beats 1 show he said: ''She was going to do it in LA. She didn't, she couldn't. She had to finish her album.

''So it got pushed back a couple months and then there was a day in New York, or like some hours in New York that she had free because she was on tour at the time as well.

''I said, 'Well OK we didn't get the vocal last time, I'm going to fly over to New York and just make sure that I get it because I really want it today.

'''This is the only day she has on tour, if it's not today it's another two months, so can I come over?'

''So I checked into the Mercer and I waited for her engineer to call me. Her engineer didn't call me and then I was texting him and I was like, 'Is she there yet?' she wasn't there yet.

''In the end it was 4am I fell asleep. I woke up at like 8 to three texts from him and he was like, 'We got it. It's great, let me get everything together for you. And you can come pick it up tomorrow'.''

And the 'summer' hitmaker has revealed Rihanna's vocals were the ''most important vocals'' he has ever had possession of.

He explained: ''I get on the plane, I sat it there opposite me in the seat, I looked at it and I was just like that was like a bank heist.

''That felt incredible, knowing that I had the most important vocals that I've ever got and it felt amazing. I would've waited six months for it.''