More and more Kiwis need their morning coffee kick-start, with 44 per cent saying they need a caffeine hit each day.
Conducted by Canstar Blue, a survey of nearly 2000 people found more women than men suffer from caffeine withdrawal symptoms.
Headaches and dizziness are associated with withdrawals, which could be why a quarter of women surveyed said they were trying to cut down their intake.
"Coffee has been New Zealand's most popular hot drink since the 1980s so it's no wonder so many of us have come to depend on it for a kick-start in the morning," Canstar Blue spokeswoman Emma Quantrill said.
In 2015 Canstar Blue found 42 per cent of Wellingtonians couldn't start their day without coffee. Aucklanders spent on average $14.02 a week, but of concern was 15 per cent said they've had so much coffee in a day they haven't been able to sleep.