A cup of coffee in the evening may be keeping you awake for more reasons than you realise, scientists say.
Their study, in Science Translation Medicine, showed caffeine was more than just a stimulant and actually slowed down the body's internal clock.
A double espresso three hours before bedtime delayed the production of the sleep hormone melatonin by about 40 minutes, making it harder to nod off.
Experts said our own actions had a huge influence on sleep and the body clock.
One of the researchers, Dr John O'Neill, from the Medical Research Council's Laboratory of Molecular Biology in Cambridge, told the BBC News website: "If you're tired and having a coffee at night to stay awake, then that is a bad idea, you'll find it harder to go to sleep and get enough sleep."
In his half of the study, cells grown in a dish were exposed to caffeine to work out how it changed their ability to keep time.
It showed the drug was able to alter the chemical clocks ticking away in every cell of the human body.
A cup of coffee in the evening may be keeping you awake for more reasons than you realise, scientists say.Their study, in Science Translation Medicine, showed caffeine was more than just a stimulant and actually slowed down the body's internal clock.A double espresso three hours before bedtime delayed the production of the sleep hormone melatonin by about 40 minutes, making it harder to nod off.Experts said our own actions had a huge influence on sleep and the body clock.One of the researchers, Dr John O'Neill, from the Medical Research Council's Laboratory of Molecular Biology in Cambridge, told the BBC News website: "If you're tired and having a coffee at night to stay awake, then that is a bad idea, you'll find it harder to go to sleep and get enough sleep."In his half of the study, cells grown in a dish were exposed to caffeine to work out how it changed their ability to keep time.It showed the drug was able to alter the chemical clocks ticking away in every cell of the human body.
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