Qadha Salaah

Q: I woke up with my alarm fajr time then I saw that there was some time for Fajr salah to end. So I decided to sleep for some time or close my eyes for some time then wakeup and pray Fajr salah but when I closed my eyes I was getting too sleepy so I said to myself and also thought that if I close my eyes or sleep for some time Fajr time will be over but my intention was to pray salah on time. So later I woke up after the time was over...

I was so sad that I woke up after the time finished. This happened for the first time with me and it was never my intention to miss the salah. After waking up after the was time over, I prayed Fajr so is my Fajr valid?

I am so worried. I was sure that if I will sleep I will wake up after Fajr time but my intention was to wake up and pray in time and I slept to get up after some minutes but unfortunately I didn't wake up. I never wanted to miss the salah.

Q: Is it permissible to pay someone to pray qaza e umri on one's own behalf or on the behalf of someone who is dead. Please answer both the scenerios

Q: How will a person put qadha salaahs in a will because the number is constantly changing as they perform them?

Q: Is it permissible to make qadhaa after asr or is it preferable to make the qadha before asr?

Also, is it permissible to make qadha salah before or after maghrib ?

Q: If a male becomes baaligh by having wet dream and ghusl becomes fardh on him, but he doesn't know that in Shariat you have to perform ghusl after having a wet dream. So he keeps praying with just making wudhu and after 3-4 months of his puberty, he comes to know that ghusl becomes fardh by wet dream. So are all his prayers in these 3-4 months counted or does he have to make qadha?

While offering these prayers again will he make intention of praying qadha prayer or will he make intention of repeating the prayer (I'adah)?

Q: I have a question about the Mas'ala of Sahib-e-Tarteeb:

1. If a person is Sahib-e-Tarteeb and he misses a prayer, for e.g. Zuhr. And then prays Asr and after praying Asr, he prays the Qaza of Zuhr. So obviously his Asr prayer is invalid. But what if after praying his Zuhr Qaza, he misses 6 more prayers. So he no longer remains Sahib-e-Tarteeb. So by missing 6 prayers will that Asr prayer which he offered becomes valid?

2. What if he then again offers all those 6 prayers' Qaza and again becomes Shahib-e-Tarteeb, will now his Asr prayer become invalid again?

Q: If someone forgets to pray Zuhr Salaah and he now prays Asr Salaah before he remembers that he had not prayed Zuhr Salaah, what should he do?

Q: I have missed so many salaah during the last 10 years since becoming baaligh. I have no idea how many and cannot estimate. It is a major sin but I don't know how to go about rectifying it. Should I just make qadha for 10 years because it's impossible to calculate?

Also, do I include Witr in my qadha. 

Q: I have many qadhaas over the past 3 or 4 years. I've tried guessing but I have absolutely no idea, records, nothing. I usually pray all 5 prayers on time now, so would it be okay for me to start praying my qadhaas without making an estimate?

As I've mentioned, I don't have the slightest clue with which to make an educated guess. The longer I keep trying to estimate, the longer it gets put off. It's been two years already.

Q: If a woman gets her haidh during the salaah time, and she hadn’t yet performed the salaah of the time, will qadha of that salaah become compulsory upon her?