One night, I was in my bed asleep, then woke up looked at the clock and it said 6am and I realised it was Monday morning and I had to get up for work. Then I woke up and realised that in fact it was Saturday and I didn't have to get up for work. Great!
But here's the best bit -
Then I REALLY woke up and found the sun out, the birds singing and a view out over the sea. I was on holiday in Greece and had dreamed that I had dreamed it was 6am on a work day back home!