Opinions on my extract please?

This is not a bad piece of writing. It flows well, the dialogue is fine and it has a readable style. One or two of your sentences seemed too short to me and could easily have been joined to the next sentence e.g. "It was late. Very late." and you finish one sentence with the word right as though you were expecting an answer and it doesn't work here at all. Try something like "I reasoned that if I stayed up and confronted him he would have to tell me so decided to give it a try." Apart from that keep writing it because it does work and it is readable. Good luck with your story.