The sun sets later, the evenings feel longer and you can sit out on the balcony a little later and listen to the birds singing. There are, of course, positives to daylight saving time. But in the coming days and weeks, millions around the world will also grudgingly lose an hour’s sleep as the clocks go forward an hour. Several dozen countries in Europe make the switch on the night from March 30 to March 31. Australia, New Zealand and parts of the Middle East and South America follow in April. For those worried about the loss of sleep, experts believe it’s worth focussing on the positives and n…