In the name of Allah the Most Gracious the Most Merciful
A common mistake in your prostration can invalidate your prayer!
By Shaykh Muhammad bin Saalih al-’Uthaymeen may Allah have mercy on him
The shaykh explains this in his explanation of “Riyaadus Saaliheen” in the fourth volume page 20. The shaykh said,
It is not permissible for one, while in prostration, to raise one or both of the hands, or one or both of the feet (from the floor). It is obligatory that the prostration is performed upon seven body parts: the forehead along with the nose, the two hands, the two knees, and the toes. If one of these are raised before rising from prostration, then the prayer is invalid! * As for if one raises quickly, while having the body parts touching the floor, then we hope that it is not something done regularly in the prayer.
*That is because prostrating on all seven body parts are considered to be a pillar of the prayer. Narrated Ibn `Abbas that he said,
“The Messenger of Allah was ordered to prostrate on seven parts and not to tuck up the clothes or hair (while praying). Those parts are: the forehead (along with the tip of nose), both hands, both knees, and (toes of) both feet.” [Bukhari]
Translated by: Abu Awzaa’ee AbdusSalaam
الفقير الى الله
Trying to Follow the Salaf 
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Asalaam Alaikum
If the person is ill and cannot place all 7 parts of his body on the floor at the same time.
I noticed that was not mentioned.
Also I am covered, my hair has to be tied up.
The answer for that was not mentioned either.
Can you please inform the reader what would be acceptable if such situation were to come up.
Shukron
PBUY always👆