United Kingdom, Feb. 4 -- Steve Irwin started his working day at 2am due to "terrible insomnia".

The late 'Crocodile Hunter' star - who died aged 44 in 2006 after being pierced by a stingray barb in the Great Barrier Reef - struggled with the sleep disorder, according to his daughter Bindi, 26.

Appearing on Sarah Grynberg's 'A Life of Greatness' podcast, she said: "He had terrible insomnia. I mean, he just never slept."

According to the Australasian Sleep Association, insomnia is defined ad someone who self-reports difficulties with falling asleep or maintaining sleep, and waking up too early at least three nights a week.

Steve had Bindi and her brother Robert, 21, with his wife Terri.

Bindi, who was just eight years old when her fat...