So far something like this has happened to me about 4 times. Here is what happens:

I have a dream lucid or non-lucid. Wake up thinking it's Saturday (or Friday/Sunday) even though it's actually Monday (or any other week day). Then I keep thinking I don't have school and don't go to school that day thinking it's the weekend.. And when my mum comes home she always gets very angry.. It's pretty annoying and I would like to know how to stop it.