Giurge found that some participants responded worse to bad sleep than others and the negative effect of a bad night’s sleep is “not a fixed character trait” but can vary day-to-day among the same people.

The study says going to work on poor sleep could lead to a destructive cycle among staff. It says the research could help explain why unethical behaviour is so persistent in organisations.

A 2015 Washington State University study published in the journal Sleep found that sleeplessness can cause the brain to “short-circuit” when it comes to decision-making.

This is how much your insomnia actually affects your ability to do your job