Aisha (rA) says, Rasulullah ﷺ stood up during the night, performed Salah and prolonged the sajdah to such an extent that I thought he had passed away. I stood up and shook his large toe, which moved. Thus, I returned (to my bed). I heard him saying in Sajdah:

When he raised his head from sajdah and completed his salah, he said, ‘O Aisha or (He said) O Humairah, did you think that Nabi ﷺ has broken his promise with you?’ I said, ‘No, by the oath of Allah, O Rasul of Allah.’ However, as a result of your lengthy sajdah, I thought you had been taken away.’ He replied, ‘Do you know what night this is?’ I replied, ‘Allah and His Rasul know best.’ He said, ‘This is the 15^th night of Shabaan. Verily, Allah (SWT) turns (with mercy) towards His servants during the 15^th night of Shabaan, forgives all those who seek His pardon, has mercy upon those who request for mercy and delays the affair of those who harbor malice.’

Source: Targib wat Tarhib (Volume 2, Page 119)