I seem to recall (it was only us last year!) that when the study leave kicked in, and we'd filled in a week or two of revision plans, I suggested that DS and I could go away for the night. Maybe take a friend. Go to the beach, find a B&B, and eat fish and chips on the sand. Nothing expensive, but something to work towards, and to come home a bit more refreshed.
In the end we went to London for 36 hours and slept on a friends floor. Did cheap last minute tickets to a show, and ate at that ridiculously rude place in China Town. Won Kei's?
It did work. Got me out of the house (and all the continual food provision), and spurred DS into a fit of work beforehand, and afterwards, too. Also gave us a chance to talk about all those decisions that need making at this point - uni choices etc etc.
Was it you, Lalsy who mentioned that? Suddenly lots of decisions, and cajoling a grumpy teenager into making them. I know some of you have younger ones about to care for, but as I said, it worked for us.
HTH someone!