Sleep

You might find interesting an experiment I made upon myself. I made an audio recording of myself sleeping. I did it by connecting the audio output of a video camera (the camera has a very sensitive microphone) into the microphone input of my computer which is very near my bed. The CoolEdit product (which is now Adobe Audition) provided the "record button" which I began when I went to sleep.

Here is the entire five hour waveform of that sleep. You can click on the image to obtain a larger picture.

You can see in the lower right corner that the wave file begins at time 0 minutes 0 seconds 000 thousandths of a second, and ends at 332:45.675 minutes (five hours and twenty minutes later).

The "hump" at the left is a 40 minute period of regular snoring. Here is a picture of a short segment of that "hump" of regular snoring: a 27 second passage at 41 minutes and 58 seconds into the large wave file. (Again, you can click on the picture to see a larger image.)

The picture shows repeated snoring at an interval of about four and a half seconds. Do you want to hear it? Listen! (Note, if you click on "Listen!" you will download a 430KB mp3 file.)

If you go back to the picture of the entire five hour sleep, there is another "hump" at the right which another period of regular snoring; from the image of the wave form you can see that the latter snoring is not as loud as the early snoring.

In the middle is a vast middle section of alternating irregular snoring and silent breathing.

In the midst are periods of what I call snorting. It is obviously caused by my breathing being blocked and then unblocked with a loud snort. Here is an example. (Click for larger view.)

I know you want to listen so here it is! (This file is a little larger than the earlier one, 560KB.)

This picture shows a 35 second period located 179 minutes into the wave file. The first two noisy breaths are four and a half seconds apart, just as they were in the earlier 27 second excerpt. However where the third breath should come is a little noise and then a loud snort when the breath is taken.

At the sixteen second mark is a short snort and the breath is clearly blocked. It remains blocked for about four and a half seconds until a wild and woolly snort takes that breath!

I'm obviously looking at this to determine if I have sleep apnea. The example at the sixteen second mark is hinting at that direction but this is a relatively infrequent event.

To illustrate let's back up and look at the above "snorting" example with a wider view. Here is a twelve minute view of the wave file from which the "snorting" example is a 35 second excerpt.

You can see there is a large period of quiet sleeping before and after the period of regular snoring with the "snorts" in the middle. By the way, the humps of sound you see are cars passing outside.


About two weeks earlier I made the first recording of my sleep. The entire waveform is here. You see that it does not display the easy pattern of the one above.

Now we are going to zoom in to a specific 27 second span. Here is the first zoom.

The second.

The third. If you check the larger picture you can see the sawthooth pattern of regular snoring.

The fourth. Even the small picture shows the snoring pattern.

The fifth.

The sixth.

This is as detailed as we will get. The span is about 30 seconds. Here is the sound of this 30 second span. Listen! The first thing you notice is that there is more ambient noise. I left the window open this first time and picked up quite a bit of street noise. The wave shows five regular snores; the sixth is delayed by several seconds.


If you want to see what happened when I got the SilentNite Snore Guard look HERE.
And here is a Second Night.
Some time later I had the SilentNight tightened and gave it a Third Night.