This calculator tells you what time to go to bed so you're not tired

A bad night of sleep can ruin your day.

But a new online calculator works out when you need to go to bed, to stop you feeling tired the next day.

Most people will know that we have different phases when we sleep, but if we wake up in the middle of a cycle then it’s pretty bad news.

Each sleep cycle lasts roughly 90 minutes and we should, ideally, be passing through around five or six of them every night.

This new calculator from Hilary’s helps estimate when you should be going to sleep by taking these all-important sleep cycles into account.

It simply asks users to put in the time they wish to wake up and it works out the rest.

For example, if you want to wake up at 7:30am, the calculator explains that you should go to bed at one of the following times: 10:16 pm, 11:46 pm, 1:16am or 2:46 am. That way you’re less likely to feel tired as you won’t wake up during a sleep cycle.

It also acknowledges that people don’t sleep straight away. Most individuals take around 14 minutes, on average, to fall asleep and this is factored into the sleep calculator.

The website reads: ‘Waking up mid-cycle can leave you feeling grumpy and tired; rising in between phases will help you to start the day with a smile on your face.’

In other news, a recent study has also found that white noise sleep apps could be having a negative effect on us. One of the professors of the study expressed concerns that the auditory system stays switched to listen to the noise – so doesn’t get any rest.

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