Two firefighters were so exhausted during the SkyCity convention centre fire they fell asleep at the top of a 32m-high ladder while manning hoses to battle the blaze.

That's according to the New Zealand Professional Firefighters Union, which also said another two fell asleep driving home after their shifts ended,

Fire and Emergency New Zealand is investigating and region manager Ron Devlin said the organisation was aware of fatigue reports.

But Devlin said the safety of firefighters was paramount and at the forefront of all decision-making at an incident.

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In a complaint to the union about management of the fire,

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