Wake up very earlier

Today, I woke up at 4 a.m. because I slept very early, at 10 p.m. , last night. Recently, I have been tired. Both the time I wake and I sleep irregular. I had taken Listening examination 2 hours ago. Now, I write this post to use a computer in building 14th. Maybe, I finishes this work soon because I will go back home to sleep.