Somehow as you laid there you wondered what it would be like to be tiny like a mouse. As you drifted away to sleep you started to shrink, strangely your clothes and in particular the hat also shrunk proportionally. Then the first changes started to appear. A stubble appeared on your face... and the rest of your body. Strangely the rest of your clothes did not only shrink, but also change their form. Your t-shirt changed into a short sleeved cargo jacket with a belt holding it closed. On the left side a coil of rope formed. You jeans changed into a pair of cargo shorts. On their back a hole formed and your spine extended through it, forming a lightly furred tail with the fur being considerably longer at its end to form a tuft.
You ass cheeks and thighs started to become more muscular and seemed to grew in contrast to your ever shrinking body. Then the changes continued at your legs. Your feet became longer and his toes formed into 3 with the toenails turning into claws extending from it. This all, except for the toes, was quickly covered in a beige coat of fur. Then the changes spread to your arms which also gained a growing coat of fur. Your hands remained fairly normal, except for his fingerpads getting a bit stronger and his fingernails growing into non-retractable dark claws.
As the changes spread up to your face, the stubble was already grown into a sizeable coat. Your nose pushed forward and grew a black pad above his nostrils. At its sides a couple of hairs grew longer and to the size, forming a set of whispers. Then the changes made your ears crow a lot, changing them into large mouse ears.
As you yawn as you wake up a set of bucked front teeth became visible. You stretch and turn around, noticing that your bed somehow doesn't feel right, feeling around that it all seems in unusual places. Opening your eyes you find that the bed sheet and pillow seemed huge. As you struggle to climb out of them you notice that your whole room seems to have grown. Then your attention shifts to your own body, your furred arms, your clothing, your muzzle and even your legs and your tail. In the distance you can see your reflection and as you want to go closer you intuitively hop off your bed and to the mirror, only realizing then that you just casually made a jump that could have hurt you as a human.