Scientists say that they have shown how the brain can crack complex mental puzzles while its owner is sleeping.
Research at Luebeck university, in Germany, says tests on 106 volunteers back up anecdotal evidence that a good night's sleep can help solve problems.
The volunteers were shown a number puzzle in which was embedded a "hidden code" revealing the answer, the journal Nature reports.
Those kept awake overnight reportedly had far less chance of solving it.
The scientists believe that because the brain appears to restructure information from the previous day during sleep hours, a period of sleep may produce insight into problems such as these. http://news.bbc.co.uk/2/low/health/3418017.stmman i could use some sleep. too many problems clawing at my back... zzzzzz...
on edit: if only dubya read newspapers, he'd sleep all day long. he desperately needs to boost his brain power.