Interactive Animation/Button help

A quick rundown of the issue im having and my goal:

I'm trying to build an interactive animation scene, where there's objects on the stage I want the user to be able to interact with certain objects and have them change the room a bit as they do. Their goal is to wake up the stickman in the bed. 

I'm running into a problem getting the animation to play correctly. I made the blanket on the bed a button, assigned an Up and Over state, and placed a movie clip in the Down state. When tested however, I have to hold the mouse button to get the animation to play, and once you release the mouse button, the the blanket returns to the bed as if untouched. 

I just want the blanket to stay off stage after the animation runs, and need the animation to play off of a click not a hold.

This is for a school assignment due sunday so any help or brainstorming is appreciated ❤️