Two Days & Two Nights

Hazrat Anas bin Maalik (RadiAllahu Anhu) reported that he said, 

‘Should I not inform you regarding two days and two nights? 

1. First day is that, when the ‘Basheer’ will come towards you, bringing to you either the message of Allah’s pleasure or Allah’s displeasure.
   
2. The second day is when you will stand before Allah and when your Book of Deeds will be handed to you, either in your right or left hand.  
3. One night is that, when the deceased will spend his first night alone in his grave.  This will be a night, like which another night never came before, 
4. and one night will be on the morning of which Qiyaamat will be established, for after this night there shall be no other night.’

Ref: Sharh us Sudoor Bi Sharh Haal al-Mawta Wal Quboor