Bismillah Hir Rahman Nir Rahim! (In the name of Allah, the most Gracious and the most Merciful!)
Assalamu Alikum! (Peace be on you!)
very interesting religion.
:statisfie Islam is lovely and simply AWESOME! No other religion better than this! Islam means "Peace". It also means "Submitting your will to GOD".
I know that you pray at regular times - pre-dawn, noon, late afternoon, sunset and evening before retiring - but when I read some accounts of Hajj, it said that in the old days the caravans would sometimes travel at night and sleep during the day to escape the heat.
Brother, Hajj has some different rituals. But by your question, do you mean
that in the old days, the caravans would miss their prayers which were supposed to be offered during the day?
But this I think is not authentic or right. Where did you read it? It is Fard (obligatory) on every Muslim to offer prayers and not to miss any! Do you know that the Prophet(pbuh) and his companions even had to offer prayers during wars?! Whenever the prayer time would become due, the Muslims would take turns to offer their prayers right on the battlefield! And...
Yes, I know prayer is better than sleep, but is it a choice or mandatory?
yes, it is mandatory! Leaving prayer intentionally is a sin.
What I wondered was... are the prayer times the same during a reversal of day/night, or are they adjusted to meet the new circumstances?
"Reversal of day/night?" didn't understand that one.
And brother, what has been established in the Quran and Sahih Hadith, that remains same no matter what! Allah (God) commands to offer 5 time prayers and so the number will always remain 5! It can't be reduced to 4 or 3 just to meet the requirements of new circumstances. No addition or reduction can be done to the laws of the Creator.
One more thing, I read a hadith (sayings of the Holy Prophet Muhammad) in which time of, I guess, Zuhar prayer became due. But the sun was shining brightly and so the temperature was very high. So the Prophet told these companions to wait for some time till the temperature drops a bit and then to offer prayer. The Prophet didn't allow them to skip the prayer at all! He just said to wait for a little while.
I imagine the same might apply for someone on shift work. If you came home after working all night, do you say Fajr at dawn as normal or do you consider that to be Maghrib because it is at the end of your day?
The time of prayers doesn't depend on Muslim's activity, it depends on the time of the day! There are prescribed times for all these 5 prayers and they must be offered at their right time. Fajr prayer would remain Fajr prayer in the above case because the definition of Fajr prayer is "a prayer which is offered at pre-dawn time". So Fajr prayer will not be called Magrib prayer even if the Muslim's day end at this time.
Like, these are just definitions and prayers' names depend on time of the day.
If a Muslim comes home after working all night, he
has to offer Fajr prayer at the right time, at its due time.
You say 'Isha just before retiring - but if you go to bed at 9am, do you still say 'Isha?
Yes, it is still called Isha. For better understanding, read the paragraph below.
"Adaan" which means "call for prayer" is given by Imams 5 times a day. Each time "Adaan" is given,it informs people that the time of one prayer, say Fajr prayer has become due. For example, at pre-dawn time, you will hear Adaan which tells you that now the time for Fajr prayer has started. Then at noon, Adaan is again heard which tells that now is the time for Zuhar prayer. Then another Adaan after 2 or 3 hours, which tell you that now has started the time of Asr prayer. Then after 2 hours maybe, another Adaan is given telling us that now the time for Maghrib prayer. Then lastly after some time, another Adaan tells you that now has begin the time for Isha prayer. And so the same cycle continues the next day.
What about noon prayers? Are you expected to interrupt your sleep for these prayers? Yes, I know prayer is better than sleep, but is it a choice or mandatory?
Dear brother in humanity, prayer is actually for our own benefit. Every teaching or obligation in Islam has some very logical and beneficial reasons behind it. And for prayers, there are spiritual, medical, scientific etc benefits behind it.
I seriously want to know.
And you are most welcome to ask me anything like regarding Islam. It would be a pleasure to answer you!:statisfie
So anything else you are curious about, or don't understand which concerns Islam?
I write novels and I have a Muslim in one of them, travelling at night. I want to know what he does because I do not want to misrepresent him or his religion.
You write novels? WOW! :statisfie And it is good to know that you don't want to misinterpret Islam.
Do you know that according to one research, every day more than one book is written against Islam! Everyday!!! (Believe me, the people who try to misinterpret Islam earn nothing but failure! What these people do, they pick up verses out of context, give false ideas about Islamic teachings, in brief, they try to use each and every method available to malign Islam!)
And the Muslim of your novel, do you represent him as a villain, an evil guy, hero or side character?
I too wanted to write a novel but just gave up that idea few years ago. I wanted to write about the adventures of a teenager Muslim, named Abdullah.

But that idea didn't survive long. Now have got more important things to do...
So brother, is there anything else you want to know about Islam?