Sound thoughts

Tell me this hasn't happened to you. As you watch late night TV, you automatically turn the sound down because it's kind of loud and your family has already gone to bed. The next day you sit down to watch some TV and wonder why you can not hear anything. YIKES! Did the sound on my tube finally die? Nope! You realize that by just hiking the volume you can once again hear the program. Conversely, you set your clock radio to "go to sleep to music" with the volume set at a comfortable level to fall asleep. The next morning, when the clock radio goes on with music, the darn thing nearly blows you out of bed! I think we are built with a day / night hearing controller which adjusts to the time of day. The problem is, I can't find it.