Making people aged under 55 start work before 9am is akin to “torture,” according to one of the UK’s leading sleep experts.
Forcing staff to work nine-to-five leaves their bodies exhausted and stressed as a result of sleep deprivation, says Dr Paul Kelley.
The Oxford University academic said it posed a threat to performance until the age of 55 when humans start needing less sleep.
Dr Kelley, said: “We cannot change our 24-hour rhythms. You cannot learn to get up at a certain time. Your body will be attuned to sunlight and you’re not conscious of it because it reports to hypothalamus, not sight.