Could It Have Been A Dream?

Was thinking about this movie recently and started to wonder if Sarah was dreaming when Sebastian fondled her when she was sleeping?

Sebastian was a bit of a creep even before he became invisible. And when Sarah first went to sleep she had two buttons undone. When she woke up there were four.

But there's some things that could indicate that it was all a dream. First, when Sarah awakens Sebastian still had contact with her breast, either his hand or possibly mouth. When she jumped up, she would have made contact with him. Also she would have heard him run toward the door and down the steps. And when he walked in, he opened the door all the way. But when Sarah woke up it was less than half way opened, so Sebastian would have needed to opened it more to leave. And we didn't hear any of the animals react which they always did when he walked by.