Sweltering, sticky nights can make drifting off to sleep feel like a near-impossible task, but choosing the right duvet can make a world of difference when the mercury rises. For those finding it hard to keep cool in bed, the 'lightweight' Silentnight Summer Breeze 4.5 Tog Duvet could be well worth grabbing while it's reduced to £18 ( king size ) from £24.99 on Amazon. Customers have heaped praise on the summer duvet for keeping them comfortable during warmer spells, with one describing it as '