I had a bit of a Mac Moment last night. I went to bed with the course I was due to teach today weighing heavily on my mind.
At some stage during the night, I was chatting with a colleague, and he offered to teach it for me. He was quite insistent, saying that he was really interested in the subject and would love the opportunity to practise it a bit. He didn't even want a copy of my notes, as he said he knew the topic inside out. Eventually, I was persuaded and accepted his offer, as I still have quite a bit of preparation to do for next week's course (on a completely different topic).
If nothing else, the fact that he offered to do it without seeing my notes should have alerted me that it was a dream - but it was so real and vivid that when my alarm went off this morning, I turned it off, rolled over and went back to sleep.
Good job I set more than one alarm and was a bit more compos mentis when the second one went off, or I'd never have made it to the class in time. But as I'm teaching again tomorrow, I think I'd better have an early night...