This allows the iPod to go to sleep and shut down when you shut your car engine, without you having to think about turning anything off.

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Over the past few days, I've been comparing the stock and Signature versions, and testing how much time it takes to set them up, start them and restart them in daily use, resume them from sleep, and shut them down.

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In the same way, they hibernate by going into torpor, they can do the same thing on a very short-term basis through the summer - if it is wet and windy and there is no food then they just shut down their body temperature and they just sleep it out.

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This means I usually never shut down my computer, preferring to put it to sleep or standby where possible.

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Likewise, when it's time to get some shut-eye, a warm red tone that promotes sleep can be dialled in.

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Many long hours of work accomplished, you save it all and shut down the computer, planning on continuing after a good night's sleep.

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The most common sleep problems in children are difficulty falling asleep and staying asleep and overall insufficient shut-eye.

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I'd get seven hours of shut-eye a night because a six-year, large-scale population study of sleep done at the University of California, San Diego School of Medicine associated it with the lowest death rate among adults.

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