What you find is that your periods of wakefulness and probably of sleep are much shorter than the cycle of days and nights--you will awaken maybe a dozen times to light, and then another dozen to darkness, more or less, and then it will be light again. The light level alters, as well, sometimes brighter and sometimes not so bright, although the darkness is usually total when it is dark.
The background noise is not exactly constant. Rather, the loudest part pulses, changing pitch and volume in surges something like surf at the shore, only faster. This sometimes changes in rate, but not greatly. There are other sounds as well. The most prevalent is a more distant sound something like wind passing through a pipe, which happens in pulses and comes to a complete momentary silence between each pulse. These pulses vary significantly in speed, but there is some imperfect correlation between the feeling of movement and the faster pulsations of the wind. There are also sounds of liquids gurgling sometimes. Behind all this, you hear the occasional erratic tones that might be speech, consonants blurred out completely, vowels barely distinguishable, as if someone were humming an unmelodious song with intricate rhythms. In the breaks you hear an even fainter but similar rumble, of a lower pitch, in response, and sometimes these two sounds overlap.
Now, when you speak of generating an inverse sound wave, do you mean that you intend somehow to create sound that counters the background noise, or are you taking about doing something inside your own brain?
When I say "teach yourself", I mean only that you are going to attempt to do something you have not done previously, and in the process create a skill or ability that you can attempt to use again in the future. Don't get hung up on those words; if you're trying to do something you've not done before, that's teaching yourself a new skill.
To distinguish the two possibilities about which I am asking, there is the possibility that you intend to go to sleep and to dream, but to attempt to recognize that you are dreaming and take control of the dream, then within the dream dream that you have telepathy, and use the power you've imagined in the dream to telepathically contact your mother, provided she is also dreaming. She would then dream that you contacted her telepathically.
There is the possibility that you are going to wait for a time when you believe your mother is probably asleep and might be dreaming, and then attempt to contact her telepathically by putting yourself in a dream-like state through which you reach out to her mind to connect to her in the dream.
It occurs to me that it might be instead that what you want to do is starting with one of those approaches (e.g., either realizing that you are dreaming already or moving into a dream-like state) you wish to connect your dream to the mother's dream, such that you can see her as a character in your dream and she can see you as a character in hers, and thus you would be sharing a dream and holding a conversation within the dream.
I'll admit that I am not at this moment entirely certain how I would cover any of those skills, but I'm sure I can, and so at the moment it's just that I want to know which I should be trying to cover before I put a lot of time into the wrong idea.
--M. J. Young