A burst of energy release in the morning leads to increased alertness but also increases feelings of hunger.

Scientists have also found that cortisol is also responsible for synchronising the internal daily rhythms that operate in the body.

Several studies have shown that cortisol levels increase rapidly shortly after waking and can stay elevated for up to an hour afterwards.

Other scientists have found that drinking coffee in the afternoon can help to offset lapses in attention that occur after a large lunch.

Recent surveys have also revealed that scientists are the heaviest coffee drinkers of all professions, closely followed by those who work in marketing and PR.

Editors and writers come in fourth place behind those working in education while doctors and health care workers feature further down the list.

Mr Miller said: “Although your cortisol levels peak between 8 and 9am, there are a few other times where blood levels peak again – between noon to 1pm, and 5.30 to 6.30pm.

“In the morning then, your coffee will probably be the most effective if you enjoy it between 9.30am and 11.30am, when your cortisol levels are dropping before the next spike.”

However, the exact time of when to drink that morning cup of coffee will vary from person to person depending on their cortisol cycle and the time when they normally get up in the morning.

Early risers may find their ideal time is earlier than those who get to enjoy a lie in.

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