At long last we have an answer.

Speaking to Glamour UK, Doctor Aragona Giuseppe said that showering in the morning is perhaps the more popular option because "it awakens the senses and refreshes you ready for the day ahead."

However, this does not mean it is the best time of day to take a shower.

Dr Giuseppe believes there are more benefits to showering at night.

He said: "The main benefit of night-time showers, however, is that during the day, your body and your hair can collect airborne allergens and irritants, dirt and grime, especially in the summer months from pollen, chemicals and sweat.

"So if you go to bed without showering, these will then transfer to your bed and sheets and may not only promote dirty bedding and nighttime allergies but could also cause itchy, irritated and dry skin as well as facial skin issues such as acne due to dirty sheets and pillow cases from day time oil and dirt."

Dr Giuseppe believes that showering at night is the better option as it promotes cleanliness and good sleep.

Dermatologist Emma Amoafo-Mensah weighed in on how long people should be showering for.

Speaking to Metro, she said: "Many people are spending too long in the shower, the optimal time spent should be less than ten minutes.

"Spending longer than this increases the chances of your skin feeling dry and irritated, especially if the water is too hot and you’re prone to dry skin."