Oscar Pistorius apparently cried himself to sleep last night after being sentenced to five-years in prison for killing his girlfriend Reeva Steenkamp last year. 

"You could hear him. Shortly after the door closed you could hear the tears ... he was torn up. Broken. The crying went on and on. We think he stopped when he fell asleep. It was really bad," a prison source tells Times Live.

Another unnamed source allegedly told the newspaper he was being monitored constantly.

"It's no picnic. Once the doors shut that's it. Other than a little grill bar window next to the cell door, through which to talk, there's no other way of communicating at night. When you talk from your cell you have to scream. For people to have heard him crying, it would have been very loud," Golden Miles Bhudu, the president of the South African Prisoners' Organisation for Human Rights, tells Times Live.

Pistorius is going through a 36-hour "comprehensive needs assessment" and orientation program to teach him the rules that he has to live by as a class "B" inmate, reports Daily Mail. His classification allows him to keep a few photographs in his cell, have two "no-contact" visits at weekends and on public holidays - with a maximum of 45 visits per year.

If Pistorius abides by the rules, at six months he can move to group "A," where he could be granted more visits and other special privileges such as consuming soda and chocolate, Daily Mail reports.  

Correctional Services department spokesman Manelisi Wolela tells Times Live they don't release a day-by-day account of the progression of any of their inmates and Pistorius will not be an exception. 

Pistorius was sentenced for five years, but he could be out in 10 months.