Exact time you need to go to bed to not feel tired

Exact time you should sleep. (Courtesy)

Even though it's only an hour, many of us find that the clocks changing really impacts our sleep. Thankfully, the weekend's change is the good one - meaning we got an extra hour kip rather than hearing that dreaded alarm clock even earlier as we do in the spring. But for some it plays havoc with their bedtime routine, and can leave them struggling to nod off or wake up for days.

In a bid to tackle this, the clever people at blind and curtain company Hillary's have come up with a calculator which works out exactly what time you need to go to bed depending on what time you need to wake up the next morning. We sleep in 90-minute cycles, and we should aim to get either five or six of these cycles every night. While the extra hour means it's likely we'll get an extra cycle, it can confuse our bodies and they have to get used to the extra sleep - which sometimes leaves us feeling sluggish.