I live in Northwest Austin, TX and have a fairly clear view of most of the northwest sky from my location...What I'm seeing are points of light appearing abruptly within a small vertical corridor (about the width of two fists held side by side at arms length) in the northwest sky (too late to view satellites) and then moving slowly (either horizontally or in an ascending/descending tangent) in a northerly direction for about 4 to 5 seconds and then fading out...This is happening on nearly a nightly basis and seems to only occur during the hour between 11:30 PM to 12:30 AM, when the activity seems to cease for the night...I'm familiar with all the regular air traffic that courses over my location and these objects don't follow any of those patterns...They are also unperturbed by air traffic that crosses their paths which leads me to believe they aren't in the atmosphere...