scary moment on the road

yesterday i fell a sleep while driving back home from being oncall the night before. i'm so glad that i didn't met an accident. i was alright just before leaving. i even called my dad to ask him out for lunch. it wasn't until half way at the traffic lights did i felt sleepy and tired. slept during the red light and only woke up a couple of moments later when the car in front of me had driven off. luckily nobody honked at me. and the 2 time i dozed off was along a long straight road. i dont usually take this road, as i would normally take the main road, which is pretty busy and cars drive quite fast. when i dozed off, my car was streering into the opposite lane. luckily there weren't any cars coming from the other side. quitely swerve back into my lane and tried very hard to stay awake until i reached home safely...