When the Switch Wave hit again Michael was in his room, sleeping soundly. So soundly, in fact, that he wasn't perturbed by the bright blue light that encompassed all earth, the inside of his bedroom include. Even during the change, only move a bit more in his bed than usual because of the discomfort it caused. But soon the change ended, and Michael was finally able to find a new position to sleep comfortably, unaware of having changed.
The same couldn't said about his roommate, who couldn't help but notice Michael now looked like a 6 year old version of himself. But even said roommate wasn't aware his friend had also changed gender, too distraught by his own body changed into a cat's one, even if his mind stayed the same.