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By James Gallagher Health editor, BBC News website
The key to learning and memory in early life is a lengthy nap, say scientists.
Trials with 216 babies up to 12 months old indicated they were unable to
remember new tasks if they did not have a lengthy sleep soon afterwards.
The University of Sheffield team suggested the best time to learn may be just
before sleep and emphasised the importance of reading at bedtime.
Experts said sleep may be much more important in early years than at other
ages.
People spend more of their time asleep as babies than at any other point in
their lives.
Yet the researchers, in Sheffield and Ruhr University Bochum, in Germany, say
"strikingly little is known" about the role of sleep in the first year of life.
Learn, sleep, repeat
They taught six- to 12-month-olds three new tasks involving playing with hand
puppets.
Half the babies slept within four hours of learning, while the rest either had
no sleep or napped for fewer than 30 minutes.
The next day, the babies were encouraged to repeat what they had been taught.
The results, published in Proceedings of the National Academy of Sciences,
showed "sleeping like a baby" was vital for learning.
On average one-and-a-half tasks could be repeated after having a substantial
nap.
Yet zero tasks could be repeated if there was little sleep time.
Dr Jane Herbert, from the department of psychology at the University of
Sheffield, told the BBC News website: "Those who sleep after learning learn
well, those not sleeping don't learn at all."
She said it had been assumed that "wide-awake was best" for learning, but
instead it "may be the events just before sleep that are most important".
And that the findings showed "just how valuable" reading books with children
before sleep could be.
Dr Herbert added: "Parents get loads of advice, some saying fixed sleep, some
flexible, these findings suggest some flexibility would be useful, but they
don't say what parents should do."
Sweet dreams
A study last year uncovered the mechanisms of memory in sleep. It showed how
new connections between brain cells formed during sleep.
Prof Derk-Jan Dijk, a sleep scientists at the University of Surrey, said: "It
may be that sleep is much more important at some ages than others, but that
remains to be firmly established."
He said babies "should definitely get enough sleep" to encourage learning, but
concentrating learning just before bedtime may not be best.
"What the data show is sleeping after training is positive, it does not show
that being sleepy during training is positive."
Old man having a nap
There is also growing interest in sleep and memory at the other end of life.
The two go hand in hand in your twilight years, particularly with underlying
neurodegenerative disorders such as dementia.
It is hoped that boosting sleep would "slow the rot" of memory function.