Tired parents hoping to train newborns to sleep through the night need to adjust their expectations, parenting expert and neuroscience educator Nathan Wallis says.

Sleep training benefits parents more than babies and people should be wary of adopting rigid routines, according to neuroscience educator and parenting expert Nathan Wallis.

Babies are expected to sleep through the night early for cultural reasons rather than scientific ones, he says.

"When you see how rapidly the brain grows, especially in the first year of life, the emphasis to get the baby sleeping through the night is not really founded on science. The brain's growing so rapidly, the baby's probably at a huge advantage to wake up four times a night and be topped up with breast milk to help that rapidly growing brain.

"There's a thing in our culture that says the earlier you do things the better, so if your antenatal class gets together after the baby's born there tends to be an unspoken competition over whose baby is going to walk first. And unspoken competition over whose baby's sleeping through the night first. The baby that actually walks first is probably the child that's most likely to be hyperactive in the group, so that's not really a competition you want to win."

While good quality sleep is important for the whole whānau, Wallis says the baby's needs should be prioritised.

"That first 1000 days of your life is so impactful on the rest of your life.

"Of course, mum and dad need to have some sleep to be able to look after all the other kids, but I don't think it's just a matter of automatically getting that baby to sleep through the night as soon as possible for the well-being of the rest of the family.

"We have to really put the wellbeing of the baby first, I think especially in that first year of life."

There's no scientific gold standard for how much sleep babies and children need, because different cultures have varying expectations, Wallis says.

"Scandinavian cultures expect their babies to sleep a lot, and they do correspondingly sleep much more than we see in the rest of the Western world. In Asian countries, it's much more normal to leave your children up to the late hours of the night.

"So it's really about just making sure that your individual child has enough sleep that they're functioning properly."

Wallis says teaching babies and children to sleep through the night is more about linking sleep cycles rather than clocking up a solid eight hours kip…

Go to this episode on rnz.co.nz for more details