I think that those kinds of 'sounds' are an important factor to take into account...
I don't recommend doing anything at home when other people are around, as they know our movements or perhaps our intentions. It's like being constantly watched, and that's risky.
If you're going to a hotel or other place where people are around.. any strange noise can attract someone's attention, so it would be good to camouflage it with something (music, tv..). At least here there will be a bunch of strangers busy with their own things.
Although it is always more advisable to choose a private place where you are completely alone.
These
2 research pdfs collect the following data:
*Agonal Breathing start: 13 / 24 sec.
*Agonal Breathing end: 1 / 2 min.
*(This phase occurs when you are unconscious) The numbers are approximate.
Short summary on the topic..
• Agonal Breathing: Gasps, less than 13 a minute and sporadic.
It is a reflex managed by the brain stem. This primal part of the brain handles life-saving functions when the rest of the brain isn't aware of what's happening.
Agonal breathing sounds like: gasping (may include strange vocalizations), snorting, sometimes moaning, sporadic breathing (not in quick succession).
This irregular pattern is brought on by the brain not getting enough oxygen. It results from anoxic brain injury.
Anoxia is much worse than hypoxia (which is when the brain can still get some oxygen and prioritize it to survive for a while). Anoxia means the body is getting no oxygen and only has minutes. Thus the agonal breathing (survival mode function).
This breathing is not normal breathing and indicates that someone is likely dying.
This means the
breathing pattern is reflexive, and no longer a response to conscious awareness. Agonal gasping at the end of life is not a "desire or hunger for air" but rather a basic reflex of the dying brain.
Agonal breathing
sounds (normal death, not hanging suicide) - Start video: 1 min 04.
Keep in mind that this sound is perfectly audible since the person has their air passage unblocked (in a hanging death it is common to have the air passage blocked; since the frontal pressure of the ligature on the neck plus the weight of the suspended body causes the base of the tongue to rise upwards and block it)
(All the sources are in the hyperlinks)