Struggling with four across and eight down on your crossword?

Scientists have discovered that getting forty winks improves your memory and helps you make links between loosely related facts.
Feeling refreshed after a full night's rest is also a great aid to "prospective memory" - being able to remember to do something in the future.
Researchers say the findings, published in the journal Psychological Science, help our understanding of the role sleep plays in brain processing as well as memory.
Professor Dr Mark McDaniel, a psychologist at Washington University in St Louis in America, said: "We found that sleep benefits prospective memory by strengthening the weak associations in the brain, and that hasn't been shown before."
The study found that sleep specifically helped us take advantage of what he calls "weak" memory cues, rather than "strong" ones.
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