I used to know someone and we used to talk at 4am. At the time I thought that I was the only person in the world (apart from you on the other end) who talked at 4am. Of course I was seventeen and thought that I had sufficient gravitational pull such that the rest of the universe was orbiting me (and I was 'studying' physics, sheesh). Since then I have realised that somehow 4am is actually a time when people who are disorientated and in love talk. Why is that?
I also know that since I paused knowing you I have never been rung by anyone emotional or upset in the early hours of the morning.
Not that I expect you to call (either of you), and that is possibly because you are not emotional or upset (of which I would hope you were not upset but suspect it not to be true every 4am), or some other option along the lines of 'you don't think I'm the right person to call'.
For that I matter I don't suppose I call either. Perhaps I am not upset. Perhaps I'm too afraid to call. Perhaps it would be selfish and I shouldn't.