Forgetfullness Prostration ( 2 )

Absentmindedly closes the prayer with salams

If one absentmindedly closes the prayer with salams before completing the number of rak'as originally intended, then

if there is a brief interval before one recalls it, one rises and prays the remaining rak'as. It is praiseworthy to also prostrate for forgetfulness before closing with salams.
if there was a lengthy interval before one recalls it, it is obligatory to repeat the prayer if was fard, and it is praiseworthy to repeat it if it was sunnah.

The criteria for a lengthy interval is the time it takes to perform two short rak'as, (approximately 1 minute). Likewise, if during that interval something that invalidates the prayer occurs, such as coming in contact with filth or much movement, then it is obligatory to repeat the fard prayer

When to Perform it

The prostration of forgetfulness is performed immediately before the closing salams of the prayer.

If one does close the prayer with salams, one is no longer entitled to perform it unless one satisfies three conditions:

That one utter the salams having forgotten the need to prostrate
That one prostrate shortly after salams
That the prayer not be invalidated by anything, such as losing one's wudu, becoming affected by filth, or turning away from the qibla for a long period of time.

Additionally, if, after salams, one merely intends not to prostrate, one is not entitled to do so if one changes one's mind later

How to Perform it:

One prostrates twice, like the prostrations of prayer. One says in them what one says while prostrating for prayer. The Arabic, transliteration, and translation of these supplications can be found in Reliance of the Traveller, Maqasid, and other books. Some scholars encourage one to say:

سبحان الذي لا يسهو و لا ينام

subhan-alladhee la yas-hu wa la yanam

سبحان من لا ينام ولا يسحو

"Subhana man la yanamu wala yashu"

(Glorified is the One Who doesn't forget or sleep) if the cause of the prostration is forgetfulness. If the cause of prostration is an intentional lapse, one is encouraged to ask Allah's forgiveness during the prostration.

But there is nothing read in between the 2 prostrations .