The start of daylight saving means a lost hour of sleep for many Australians, but it might not be such a burden due to COVID-19 lockdown restrictions.
Clocks in NSW, Victoria, South Australia, Tasmania and the ACT will go forward one hour from 2am Sunday.
The change means Sydney and Melbourne will be an hour ahead of Brisbane, 90 minutes in front of Darwin and three hours ahead of Perth.
People normally find it difficult to adapt to the time change, Swinburne University researcher Greg Murray said.
But with several centres in lockdown, it's not clear how daylight saving might impact people who have been working from home, the professor added.
"One possibility is that the increased lifestyle flexibility of working from home will smooth the transition - fewer people will actually lose that hour of sleep, which is one of the problems of daylight saving time," Prof Murray added.
Daylight saving will end on Sunday April 3, 2022.
Queensland, Western Australia and the Northern Territory do not have daylight saving.