I've tried both and concluded the "head-towards-sink" seems better. You can see a TV if you put it on the microwave cabinet, see anyone creeping around the door, and you can easily do a swan dive from the door to the bed.
That said, with the sink so small and close, you have a good chance to get the bed wet when you are doing dishes, which would be where your head is.
But, also important is this - where does the sun come up. If you keep the curtains open (I do), you don't want the morning sun right on your face. That seems like the better determining factor.