A Cromwell man appeared to claim sleep-walking as a defence for drink-driving and hitting a parked vehicle in the town last year.

Logan John Mitchell, 27, earlier admitted drink-driving - his third such conviction - and careless driving on August 19, 2017.

During sentencing in the Queenstown District Court yesterday, Judge John Brandts-Giesen said Mitchell was behind the wheel of a Nissan Atlas truck at 4.35am when he hit a parked vehicle, the impact causing a loud bang and shunting the other car forward about 10m.

Both vehicles were extensively damaged and subsequently ''written off'', the judge said.

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A breath test gave a reading of 750mcg. The legal limit is 250mcg.

Mitchell's lawyer, Fiona Guy-Kidd, described it as a ''lapse of judgment'' and said her client had done everything he could to ''make it better''.

That included paying the insurance excess, reimbursing the owner of the other vehicle for petrol and making an emotional harm payment.

While Judge Brandts-Giesen described it as ''pretty bad driving'', Guy-Kidd said Mitchell had ''no recollection of it''.

''He doesn't know if he was awake at the time.''

The judge responded ''sleep-walking ... is an interesting conclusion''.

''There are plenty of people, in particular ... children, who may sleep walk, but not many of them go driving vehicles.''

Guy-Kidd said a letter from his mother, provided to the court, indicated there was ''further activity than just walking'', exacerbated when he was ''very tired''.

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However, in sentencing Judge Brandts-Giesen told Mitchell he should discuss the potential medical condition with a doctor.

''Claims like this may be valid, but it may be something to be managed in another way.

''Alcohol is not a good way to manage sleep-walking.''

Judge Brandts-Giesen said alcohol ''clearly'' played too great a part in his life and ''gets you into trouble''.

While he accepted his two previous convictions for drink-driving were ''some years'' ago, he felt Mitchell should have ''remembered and would have learned something'' from them.

''You seem to have a bit of a wild south attitude towards drinking and driving ... all too often [that] results in shattered lives ... and battered cars.''

On both he was disqualified for 15 months, backdated to September 26, 2017, sentenced to nine months' supervision with special conditions, and ordered to complete 150 hours' community work.