Justin Bieber has admitted that his security guards would sneak into his bedroom to check his pulse after he slept following drug binges.

The Canadian singer recently revealed that he became addicted to taking pills and smoking cannabis when he was just 13.

"There was a sense of still yearning for more," he says in an interview with the new edition of GQ. "It was like I had all this success and it was still like: 'I'm still sad, and I’m still in pain. And I still have these unresolved issues.’ And I thought all the success was going to make everything good.

"I just lost control of my vision for my career," he added.

"In this industry, you’ve got people that unfortunately prey on people’s insecurities and use that to their benefit.

"And so, when that happens, obviously that makes you angry. And then you’re this young angry person who had these big dreams, and then the world just jades you and makes you into this person that you don’t want to be.

Bieber with his wife Hailey

"And then you wake up one day and your relationships are f***ed up and you’re unhappy and you have all this success in the world, but you’re just like: ‘Well, what is this worth if I’m still feeling empty inside?’

"And so, for me, the drugs were a numbing agent to just continue to get through."

A now sober Bieber, who has just released his sixth album Justice, also said that his struggles with addiction had a severe impact on the first year of marriage to his wife, Hailey.

"There was just a lack of trust," he said. "There were all these things that you don’t want to admit to the person that you’re with, because it’s scary. You don’t want to scare them off by saying: ‘I’m scared.'"

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