The often-maligned practice will give everyone an extra hour of daylight at the end of each day.

Most smart devices and computers will automatically adjust the time; however, older clocks and watches need to be changed manually.

Best to do it the night before if you've got somewhere to be on Sunday.

Daylight saving will last until April 3, 2022, when clocks will have to be turned back by one hour.

A way to remember how to change clocks for daylight saving is "spring forward" at the start, and when it ends in autumn, it's "fall back".

Joining NSW in turning their clocks forward will be Victoria, Tasmania, South Australia and the ACT, while Western Australia, the Northern Territory and Queensland prefer to avoid the practice.

The exact date of daylight saving differs every year, but traditionally it begins on the first Sunday of October, and ends the first Sunday of April.

A ResMed Sleep Health Survey shows one-in-four Australians are already not getting enough sleep, and almost half of adults have trouble sleeping three or more nights a week.

"The spring forward can actually present significant sleep health issues for some of us," ResMed's Dr Carmel Harrington said.

"We may gain another hour of daylight, but our body clock is not so quick in its adjustment, and we will find it harder to go to sleep that hour earlier and find it difficult to wake up that hour earlier."

Dr Harrington suggests adjusting your body by waking and going to bed earlier on Saturday to make up for the lost time overnight and make bedrooms as bright as possible to help you wake up.

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