'He'd sleep either zero or two hours a night for YEARS': The late Heath Ledger's manic energy revealed as documentary delving into actor's life is set to premiere

A documentary delving into the life of the late Heath Ledger, is set to premiere at the Tribeca Film Festival on April 23.

And an interview with the team behind the footage on news.com.au, has revealed the star's inability to switch off his manic energy.

'He'd sleep either zero or two hours a night for years,' co-director Derik Murray told the publication.

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'He'd sleep either zero or two hours a night for YEARS': The late Heath Ledger's manic energy was revealed on news.com.au, as documentary delving into the actor's life is set to premiere

'He'd sleep either zero or two hours a night for YEARS': The late Heath Ledger's manic energy was revealed on news.com.au, as documentary delving into the actor's life is set to premiere

Derik revealed Heath's manic energy had plagued him for years.

'He'd sleep either zero or two hours a night for years. He would call people up in the middle of the night,' he shared.

Musician and friend Ben Harper told of a similar occurrence, to be shown on the documentary.

The 47-year-old tells of how the 10 Things I Hate About You Star would often show up unannounced at his house, for breakfast, at six in the morning. 

The life of Heath: I Am Heath Ledger, tells of the star's friendship with Matt Amato, 49, the pair having co-founded production company, the Masses

The life of Heath: I Am Heath Ledger, tells of the star's friendship with Matt Amato, 49, the pair having co-founded production company, the Masses

Candid: Nine years following the tragic death of Heath, Matt decided to open up about his friendship in the documentary: 'This is definitely more the truth than anything else that's out there,' he told news.com.au

Candid: Nine years following the tragic death of Heath, Matt decided to open up about his friendship in the documentary: 'This is definitely more the truth than anything else that's out there,' he told news.com.au

I Am Heath Ledger, tells of the star's friendship with Matt Amato, 49, the pair having co-founded production company, the Masses.

Nine years following the tragic death of Heath, Matt decided to open up about his friendship in the documentary.

'This is definitely more the truth than anything else that's out there,' Matt told news.com.au.

Insisting on getting ex-wife Michelle Williams' approval, he noted: 'She said, ''We should do something now. Matilda (their daughter) is curious''.'

Approval: Insisting on getting ex-wife Michelle Williams' approval, producer Matt Amato noted: 'She said, ''We should do something now. Matilda (their daughter) is curious'''

Approval: Insisting on getting ex-wife Michelle Williams' approval, producer Matt Amato noted: 'She said, ''We should do something now. Matilda (their daughter) is curious'''

Family ties: Heath and Michelle, who met on the set of Brokeback Mountain in 2004, shared a daughter, Matilda, now 11

Family ties: Heath and Michelle, who met on the set of Brokeback Mountain in 2004, shared a daughter, Matilda, now 11

Heath was found dead on January 22, 2008 at the age of 28, from an accidental overdose of prescription medication.

He was living alone at a New York apartment at the time, having split from his girlfriend, actress Michelle Williams, in 2007.

The couple, who met on the set of Brokeback Mountain in 2004, shared a daughter, Matilda, now 11.

Matilda who was just two years old when her father passed away and remains living with her mother in New York City.   

Tragic passing: Heath was found dead on January 22, 2008 at the age of 28, from an accidental overdose of prescription medication. Pictured in September 2007

Tragic passing: Heath was found dead on January 22, 2008 at the age of 28, from an accidental overdose of prescription medication. Pictured in September 2007

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