I’m not sure what “backed to the headboard” is supposed to mean. Does that mean she moved back to lean against the headboard?
Let me ask you something: have you or someone you know ever had a nightmare and then woken up like that? Suddenly snapping their torso up to sit, scooching back, and then immediately grabbing their knees?
It’s a very clichéd scenario. There’s even
a tvtropes page on it showing some of the other times this exact same wake-up method has been utilized. I’m not saying it’s a bad thing to use this; it just has to be done
well.
I want to know what the nightmare is about. All you’ve done is tell me that it existed, but she has no idea what happened in it. It’s a bit of a letdown.
Who is this “she”? Do we get a name?
It looks like She (whoever she is) is your POV character. As such, her keen observations on the exact temperature (66 degrees!) comes off as very strange, especially since she just woke up.
Would I continue reading this?
No. It’s not a very interesting start to a story. I was not hooked.