It is reported that Anas b. Mâlik – Allâh be pleased with him – said:

There are two days and two nights the likes of which no one has ever heard of before: the Day on which you will receive the news about Allâh the Exalted: whether you will receive His punishment or His mercy, the Day you will be given your book (of deeds): either in your right hand or your left, that [first] night you will spend alone in your grave, a night like no other you have spent, and that night on the morning of which will be the Day of Resurrection, after which there will be no more night.

Abû Bakr Al-Daynûrî, Al-Mujâlasah wa Jawâhir Al-‘Ilm article 19.