We all recognize the importance of a good night’s sleep – but what about those long waking hours? Is our monophasic sleep pattern ideal?
Forget the extra jolt of caffeine: new research suggests a nap a day can keep ‘brain fog’ at bay!
Students are known to stay up all night cramming for exams. However, a Berkeley study highlights that they would be much better off with a dose of shut-eye. ‘Sleeping on the job‘ may warrant more investigation. North America could benefit by adopting a siesta as part of our daily work regime.
“New research from the University of California, Berkeley, shows that an hour’s nap can dramatically boost and restore your brain power. Indeed, the findings suggest that a biphasic sleep schedule not only refreshes the mind, but can make you smarter.
Conversely, the more hours we spend awake, the more sluggish our minds become, according to the findings. “Sleep not only rights the wrong of prolonged wakefulness but, at a neurocognitive level, it moves you beyond where you were before you took a nap,” said Matthew Walker, an assistant professor of psychology at UC Berkeley and the lead investigator of these studies.”
The study involved 39 young adults, who were deemed healthy. One group took a 1.5 hour afternoon nap, while the other group continued without a nap. At noon, both groups were given mentally challenging tasks (specifically targeted towards the hippocampus and storing fact-based memories). The two groups performed comparably.
At 6pm, additional testing was performed. It was interesting to note that the group who had not napped experienced greater difficulty in executing the tasks, while the other group demonstrated a higher learning capacity.
“Matthew Walker found that a nap clears the brain to absorb new information. These findings reinforce the researchers’ hypothesis that sleep is needed to clear the brain’s short-term memory storage and make room for new information, said Walker [ ].
Since 2007, Walker and other sleep researchers have established that fact-based memories are temporarily stored in the hippocampus before being sent to the brain’s prefrontal cortex, which may have more storage space.
“It’s as though the e-mail inbox in your hippocampus is full and, until you sleep and clear out those fact e-mails, you’re not going to receive any more mail. It’s just going to bounce until you sleep and move it into another folder,” Walker said.
In the latest study, Walker and his team have broken new ground in discovering that this memory-refreshing process occurs when nappers are engaged in a specific stage of sleep. Electroencephalogram tests, which measure electrical activity in the brain, indicated that this refreshing of memory capacity is related to Stage 2 non-REM sleep, which takes place between deep sleep (non-REM) and the dream state known as Rapid Eye Movement (REM). Previously, the purpose of this stage was unclear, but the new results offer evidence as to why humans spend at least half their sleeping hours in Stage 2, non-REM, Walker said. [ ]
Walker and his team will go on to investigate whether the reduction of sleep experienced by people as they get older is related to the documented decrease in our ability to learn as we age. Finding that link may be helpful in understanding such neurodegenerative conditions as Alzheimer’s disease, Walker said
Reference:
UC Berkeley News – 22 Feb 2010
