the girl who woke up laughing

Yes, this morning when i woke up (as in when i gained consciousness), i was laughing like mad. I know there was this dream abt this postgrad student in my lab called jeremy and my friend melissa. In the dream, this jeremy person is my teacher (he IS the most senior in the lab but i've never heard him say anything except "yeah") and he was asking the class whether they agreed with something he said..(ironic, eh?) and usually in real life the students just say "yes" as a whole or keep quiet or smthng rite.. in the dream, each one of my classmates had to stand up and say "it is ok" or smthng to agree with wat he was suggesting.. and i stood up and said "yeah, it's fine" and sitting next to me was melissa (but the face was actually joan's).. So melissa-with-joan's-face stood up and said something really funny, and the whole class started laughing.. that's when i woke up, and i was still laughing..i realised how weird it sounded - me laughing by myself lying on the bed at 6am..thank god there was noone around..i wld hav freaked them out..but the thing is i didn't stop laughing! i was laughing like mad, only after quite some time i stopped - that too becos i forgot why i was laughing.. Then i fell asleep again..