A new study claims that sleep-deprived workers face a higher risk of death and are costing the UK economy £40bn a year.
The BBC says the calculation is based on tired employees being less productive or absent from work altogether.
Data from 62,000 people was used by research firm Rand Europe who said that the loss equated to 1.86% of economic growth.
Rand Europe's report called on employers to recognise and promote the importance of sleep, urging them to build nap rooms.
“The effects from a lack of sleep are massive. Sleep deprivation not only influences an individual's health and well-being but has a significant impact on a nation's economy," said Marco Hafner, a research leader at Rand Europe.