Undisturbed night's sleep needed for good memory

 

A continuous night's uninterrupted sleep may be the essential requirement for a good memory, according to a study carried out on laboratory mice. The animals failed to remember things after being repeatedly disturbed while they dozed. The research is more subtle than it first appears because the researchers did not just investigate disturbed sleep, which can cause memory loss through stress, but also the length of time the mice engaged in deep sleep, when memories are believed to be consolidated by the resting brain.

Many people who suffer from interrupted sleep, such as alcoholics and patients with sleep apnoea, caused by abnormal pauses in their breathing, often complain of poor memory. The study on mice may help to explain how sleeping brains are unable to consolidate their memories, scientists said.

It is not just sleep per se that is important for a good memory, but the length of continuous sleep, the study found. The experiments on sleeping mice "point to a specific characteristic of sleep – continuity – as being critical for memory," said Craig Heller, professor of biology at Stanford University Medical Centre in California.

Scientists have for many years believed that sleep is essential for a good memory but it has been difficult to tease apart the different factors involved. Waking humans and animals in mid sleep, for instance, can increase stress levels, which has been independently shown to affect memory formation, said Dr Luis de Lecea, associate professor of psychiatry and behavioural sciences at Stanford.

"Rodents are very sensitive to physical awakening. If you wake one up, it's going to be up for a while, and it will experience stress," Dr de Lecea said.

To get around the problem, the scientists used a kind of genetic modification that made certain nerves cells sensitive to light. These play a key role in switching between sleep and wakefulness, which meant that the scientists could use short bursts of light to fragment the animal's sleep without affecting the total time spent asleep or the quality of the sleep – whether it was deep sleep, for instance, or dreamy "rapid-eye-movement" sleep.

The study is published in the journal Proceedings of the National Academy of Sciences.

Start your day with The Independent, sign up for daily news emails
News
Courtney Love has admitted using heroin while pregnant with Frances Bean Cobain, her daughter with Kurt Cobain
people
Sport
Murray celebrates reaching the final
tennis
Life and Style
life
Arts and Entertainment
'The Archers' has an audience of about five million
radioA growing number of listeners are voicing their discontent; so loudly that even the BBC's director-general seems worried
PROMOTED VIDEO
ebooks
ebooksA year of political gossip, levity and intrigue from the sharpest pen in Westminster
Latest stories from i100
Have you tried new the Independent Digital Edition apps?
Independent Dating
and  

By clicking 'Search' you
are agreeing to our
Terms of Use.

iJobs Job Widget
iJobs General

Recruitment Genius: Senior Software Developer - Java

Negotiable: Recruitment Genius: This award-winning digital publishing solution...

Austen Lloyd: Construction Solicitor - City

Excellent Salary: Austen Lloyd: NON-CONTENTIOUS (0-2 PQE) - A rare opportunity...

Recruitment Genius: Senior Financial Analyst

Negotiable: Recruitment Genius: A Senior Financial Analyst is required to join...

Recruitment Genius: Business Support Administrator - Part Time

Negotiable: Recruitment Genius: This is an opportunity to join the South West'...

Day In a Page

Isis hostage crisis: Militant group stands strong as its numerous enemies fail to find a common plan to defeat it

Isis stands strong as its numerous enemies fail to find a common plan to defeat it

The jihadis are being squeezed militarily and economically, but there is no sign of an implosion, says Patrick Cockburn
Virtual reality thrusts viewers into the frontline of global events - and puts film-goers at the heart of the action

Virtual reality: Seeing is believing

Virtual reality thrusts viewers into the frontline of global events - and puts film-goers at the heart of the action
Homeless Veterans appeal: MP says Coalition ‘not doing enough’

Homeless Veterans appeal

MP says Coalition ‘not doing enough’ to help
Larry David, Steve Coogan and other comedians share stories of depression in new documentary

Comedians share stories of depression

The director of the new documentary, Kevin Pollak, tells Jessica Barrett how he got them to talk
Has The Archers lost the plot with it's spicy storylines?

Has The Archers lost the plot?

A growing number of listeners are voicing their discontent over the rural soap's spicy storylines; so loudly that even the BBC's director-general seems worried, says Simon Kelner
English Heritage adds 14 post-war office buildings to its protected lists

14 office buildings added to protected lists

Christopher Beanland explores the underrated appeal of these palaces of pen-pushing
Human skull discovery in Israel proves humans lived side-by-side with Neanderthals

Human skull discovery in Israel proves humans lived side-by-side with Neanderthals

Scientists unearthed the cranial fragments from Manot Cave in West Galilee
World War Z author Max Brooks honours WW1's Harlem Hellfighters in new graphic novel

Max Brooks honours Harlem Hellfighters

The author talks about race, legacy and his Will Smith film option to Tim Walker
Why the league system no longer measures up

League system no longer measures up

Jon Coles, former head of standards at the Department of Education, used to be in charge of school performance rankings. He explains how he would reform the system
Valentine's Day cards: 5 best online card shops

Don't leave it to the petrol station: The best online card shops for Valentine's Day

Can't find a card you like on the high street? Try one of these sites for individual, personalised options, whatever your taste
Diego Costa: Devil in blue who upsets defences is a reminder of what Liverpool have lost

Devil in blue Costa is a reminder of what Liverpool have lost

The Reds are desperately missing Luis Suarez, says Ian Herbert
Ashley Giles: 'I'll watch England – but not as a fan'

Ashley Giles: 'I'll watch England – but not as a fan'

Former one-day coach says he will ‘observe’ their World Cup games – but ‘won’t be jumping up and down’
Greece elections: In times like these, the EU has far more dangerous adversaries than Syriza

Greece elections

In times like these, the EU has far more dangerous adversaries than Syriza, says Patrick Cockburn
Holocaust Memorial Day: Nazi victims remembered as spectre of prejudice reappears

Holocaust Memorial Day

Nazi victims remembered as spectre of prejudice reappears over Europe
Fortitude and the Arctic attraction: Our fascination with the last great wilderness

Magnetic north

The Arctic has always exerted a pull, from Greek myth to new thriller Fortitude. Gerard Gilbert considers what's behind our fascination with the last great wilderness