Looks like Sleeper is the new Unreserved. After Gaya there were unreserved travellers trying to occupy any little space that was available. After Allahabad people were sleeping on the floor, aisles and common areas near the toilets. TTEs were only checking to see if they had [unreserved] tickets. Charging point did not work and the berths were dusty. I was practically forced to spend all my time in my upper bunk. And, of course, the usual Delhi-Allahabad sector delay which meant arrival at 0930 instead of 0600. Deeply disappointing - I did not expect a mainstream train like Poorva to be so shabby.