Article: The art of Zzzz.

Byline: ALISON TYLER

LAST week I slept in seven different beds and four different countries, so if there's one thing travel journalists know all about, it's the art of a decent night's kip.

This week I was the first to test a revolutionary new bed at the Zetter hotel in Clerkenwell.

The FreshBed filters air through the mattress, which means you can regulate the temperature for each half of the bed. Scientists inform me that 28 degrees is the optimum sleeping temperature, but that felt too hot, so I opted for a cooler 24.

But that's not the real magic.

The constant air flow also keeps the bed dry - the average person sweats ...

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