Image caption Land of the midnight sun: the day is more than 20 hours long during summer in northern Finland

Practising Muslims across the world are observing Ramadan. For one month, they are fasting between first light and sunset. But what do Muslims do in a town where the sun never really goes down?

The town of Rovaniemi in Finland lies in a land of extremes.

At 66 degrees north it straddles the Arctic Circle in Finnish Lapland. During midwinter it is cloaked in total darkness. But in the summer it is bathed in daylight.

The long days pose a particular problem for fasting Muslims like Shah Jalal Miah Masud.

It doesn't get dark. It always looks the same. The sun is always on the horizon Shah Jalal Miah Masud

The 28-year-old moved to Rovaniemi - 830km (515 mile) north of the capital, Helsinki - from Bangladesh five years ago to study IT. He has not had any food or water for 21 hours. And he laughs.

"It doesn't get dark. It always looks like the same, the sun is always on the horizon and it's quite difficult to get what the time is actually right now," he says.

It is 11 o'clock in the evening and the sun has only just dipped below the horizon. The sky has turned a beautiful deep, rich blue. This is as dark as it will get, then the sun will rise again in five hours.

Masud says it is difficult to fast according to Finnish time and admits he is tired. But despite the hunger and fatigue, he says it is a pleasure to observe Ramadan during the long Finnish days.

There is another option which reduces the number of fasting hours - mark its duration by the rising and setting of the sun in countries far to the south of Finland. Dr Abdul Mannan - a local Imam and president of the Islam Society of Northern Finland - says there are two schools of thought.

"The Egyptian scholars say that if the days are long - more than 18 hours - then you can follow the Mecca time or Medina time, or the nearest Muslim country time," says Dr Mannan.

"The other (point of view) from the Saudi scholars says whatever the day is - long or short - you have to follow the local time."

Image caption Nafisa Yeasmin follows the Mecca timetable

Dr Mannan says the majority of Muslims in northern Finland observe either Mecca's fasting hours or Turkish time because it is the nearest Muslim country to Finland.

For Nafisa Yeasmin, a researcher at the University of Lapland, choosing when to fast has not been an easy decision. She moved from Dhaka in Bangladesh six years ago with her husband and two children.

Her spacious Scandinavian-style kitchen - full of white cupboards and wooden work surfaces - smells of frying onions, turmeric, chilli and cumin.

As she prepares her traditional iftar meal, she recalls her first Ramadan in Rovaniemi when she decided to fast according to Finnish daylight hours, going without food for up to 20 hours a day.

"It was very difficult to follow because in Bangladesh we are used to 12 hours' daytime and 12 hours' night-time," she says.

Ramadan: most sacred month in Islam Image caption Koran Muslims abstain from food and drink while fasting during daylight hours

Ramadan is intended to increase self-control

Muslims try to give up bad habits and pray more during the holy month

Families and friends often gather to break the fast after sunset with the iftar meal

"Then I thought, not any more. I have to follow Mecca's timetable. But I'm a little bit worried whether Allah will accept it or not."

Many Muslims come to Finland as refugees from all over the world, particularly Somalia, Iraq and Afghanistan. Since 2001, Finland has accepted 750 refugees a year. New arrivals are often sent to live in towns like Rovaniemi in the far north in a government resettlement programmes.

In Rovaniemi the long days are not the only obstacle that fasting Muslims face.

No shop in this town of 60,000 sells halal food, which is prepared according to Islamic law. The nearest town, Oulu, that does is 300km away. Another option is Lulea, across the border in Sweden.

Yeasmin opts for Lulea, which is a six-hour round trip journey by car, with a shopping list full of items, including black chickpeas, dates, rice crackers and lots of halal meat.

Understandably, she has stocked up for the whole month of Ramadan. To make her point, she opens her huge white fridge - covered in her children's school photos - to reveal all seven trays crammed full of frozen halal meat.

Ending the fast Festival that marks end of the holy month of Ramadan is Eid al-Fitr

Marked with special services outside and in mosques, street processions and a celebratory feast - the first daytime meal in a month

The menu varies according to region. Dishes served can include stuffed date parcels (above) More Eid al-Fitr recipes by BBC chefs

Yeasmin and Masud both enjoy life on the Arctic Circle and say local people are very welcoming and respectful of their religion.

60,000 Muslims live in Finland 1% of population is Muslim

Tatar Muslims from Russia and Turkey brought Islam in the 1870s

They worked as merchants in the Helsinki area, trading furs and textiles

But they say it is hard to be thousands of kilometres from home, family and friends during a major religious festival.

"We used to break the fast and share the iftar meal together. Now I do it on my own," says Miah Masud.

"It's like normal life here, no feeling of a festival. I feel like I'm missing something."

Mark Bosworth's report aired on Newshour on the BBC World Service.