A team of researchers in Britain has carried out the study and found that almost 60 per cent of employees have their worst night's sleep of the week on Sundays with restless nights forcing one in four to call in sick on a Monday.

Moreover, disrupted sleep has also been blamed for a lack of concentration at work (nearly 46 per cent) on Mondays, increased irritability towards bosses (30 per cent) and the odd impromptu nap at the desk (20 per cent).

"Millions of workers are starting the week tired and unmotivated," according to Leigh McCarron of hotel chain Travelodge which commissioned the research.

However, the survey of 3,500 adults has found that Friday provided the best night's sleep, with eight in ten people getting their least disrupted night's sleep at the end of the working week, according to The Daily Telegraph.

In fact, millions of adults across the world claim they suffer regularly from insomnia and most blame concerns over work for keeping them awake on a Sunday night.

Britons are said to lose an average of 51 minutes of sleep each night to worrying, a total of one month's worth of sleep every year.