Dr Staton said this study examined the relationship between mandatory nap times in childcare and children's night-time sleep duration concurrently and then 12 months later.
"Our findings raise important questions regarding the most appropriate timing and approach for transitioning away from naptimes in young children," Dr Staton said.
"There is not a specific age at which children no longer need naps, as this will vary from child to child."
"For the first time this study shows a relationship between observed naptime practices in childcare and children's night-time sleep," Dr Staton said. "This means all children are required to lie on their bed and are not permitted to engage in any other activity."
It found children who were exposed to more than 60 minutes mandatory sleep at childcare slept worse at night which continued when they started school.
"The results showed that children exposed to more than an hour of mandatory naptime in their childcare setting had, on average, 24 minutes less night-time sleep when in childcare," she said.
Dr Staton said, however, it was estimated 30-40 per cent of children have sleep problems in the years prior to school.
"Insufficient night-time sleep in young children significantly increases the risk of poor health and developmental outcomes, most notably behavioural problems," she said.
She said the study also found once in school, children who had been exposed to more than 60 minutes of naptime had a total sleep duration that fell below the recommended average for children aged 3-5 years as set out by the National Sleep Foundation.
Dr Staton said Australian legislation required all childcare services provide for each child's individual sleep and rest needs but there were currently no specific guidelines regarding how children's sleep needs should be met.
"Consequently, decisions regarding the duration and mandating of naptimes for preschool children are made at an organisational level and can be influenced by staffing constraints," she said.
"Given the number of young children who attend childcare and the relationship of night time sleep with multiple health outcomes, childcare sleep practices represent an important focus for child health."
- QUT Best of Health August 2015