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He is suffering from infective endocarditis, an infection in the inner lining of the heart or its valves which affects one in 30,000 people in the UK.

Mr Golombek described the medical cause of death as "multi organ failure as a result of infective endocarditis and hospital acquired pneumonia".

Sleep deprivation led to endocarditis, a rare and life-threatening infection of the heart’s inner lining.

"Recalcitrant and recurring infections, be that UTIs, pneumonia, endocarditis, or diabetic foot ulcer infections, are often associated with biofilms," he said.

Infective endocarditis, also called bacterial endocarditis, is an infection caused by bacteria that enter the bloodstream and settle in the heart lining, a heart valve or a blood vessel.