I think the concepts very good, since I do remember being very young and having to keep checking my room for monsters whilst still trying to get to sleep. The mechanics, however, seem confusing to me? I was able to beat the game easily by just sitting up for 9 nine seconds and then laying down and sitting up again to reset the timer. This is excluding the fact that you can sit up and lay down when looking at the clock which I assume is a bug. 

Also, I think you've accidentally used more than just two colours. The text on the title screen seems to be antialiased which has added some grey pixels. Also some of the shades of black or white don't match, like the hat on the logo is a greyer white than the rest of the title, or the black of the quilt is darker than the background or the white on the character is lighter than the white of the bed. This isn't that big of a deal since it was unintentional but you should try to avoid it in the future

Hooray! I finally played your game. Time seems to move faster—or only really starts moving—when you look at the clock, right? I liked the concept: constantly checking the clock but trying not to get spooked by something in the dark. Good job.