Hehehe!
The saga of the young criminal continues.
He came down at about 8 and apologised, and we had a bit of a chat about it all. He was reasonably sorry, but eventually I sent back to bed. He seemed outraged at this, so I assumed he was not truly contrite.
His dad came home and went up for a man-to-man chat. It transpired that DS1 had had a bit of a kip and as it was still light, had woken up assuming it was 8am, and that he had been up there for 15 hours, and that his dad had popped in before leaving for work!!! Hence his anger at being sent back up there.
This event has a particular resonance for this household, as his dad once was doing shift work, and woke up at 5 ready for his next shift, ate his cornflakes, shaved and so on, and drove off to work. He was baffled at the amount of traffic, and then it dawned on him - he was 12 hours early!!! It was 5pm the day before!!! He had just gone to bed!!!