"Ha. Mim.
By the Book that makes things clear
We sent it down during a Blessed Night: for We (ever) wish to warn.
Whereon every wise command is made clear" (59: 1-4)

Also,
"The month of Ramadan in which was revealed the Qur'an, a guidance for mankind, and clear proofs of the guidance, and the Criterion (of right and wrong)......" (2:185)

And finally Surah Qadr,

"We have indeed revealed this (Message) in the Night of Power.
And what will explain to thee what the night of power is?
The Night of Power is better than a thousand months.
The angels and the Spirit descend therein, by the permission of their Lord, with all decrees.
Peace until the rising of the dawn." (97: 1-5)

Therefore, as per the Quran and Authentic hadith, the whole book had been revealed in the nearest sky in one night and thereafter, Jibreel revealed it to our prophet part by part.

But we have a trouble maker,
"The angels and the spirit ascend unto him in a Day the measure whereof is (as) fifty thousand years" (70:4)

So, how is it possible equating a journey of 50 thousand years to mere a one night? Could it be a wormhole formed on this night reducing fifty thousands years' flight to a single night's journey? Is that the reason why its called "Mighty Night"?