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Browsing a school book, Medieval Britain by Brenda Williams, I came across three precautions recommended by doctors to help people avoid going down with the plague. These were:

  • cover windows
  • avoid sleeping on your back
  • breathe in toilet smells

I am assuming that covering windows was considered a preventive measure because these doctors believed that the plague was airborne.

As for breathing in toilet smells, I can only guess that they thought that this would mean you wouldn’t be breathing in the plague – but why toilet smells specifically? It doesn't fit with miasma theory.

Another recommendation, which does fit with miasma theory, was

carrying sweet-smelling flowers and herbs or ornate pomanders to purify the air.... Keeping a sweet-smelling pomander close by was believed to offer protection.

Concerning ‘avoid sleeping on your back’ I'm not sure I can even guess the reasoning behind this (religious significance?).

Why did doctors apparently believe in the three precautions listed above?

Note: I’m not asking why people in medieval times held strange beliefs about disease prevention and cures (basically, a lack of scientific knowledge), just why they thought the preventive measures mentioned my question would be effective.

EDIT

Concerning the comments (understandably) doubting the accuracy of 'breathing in toilet smells', I found the following passage in L. C. Slavicek's The Black Death

...some medieval physicians thought that foul rather than pleasant odors were the best way to keep the Great Mortality at bay. Consequently, it was not unusual during the Black Death to see large groups of people in stricken towns leaning over the edge of the community latrine and inhaling deeply!

My highlighting, but the punctuation is the author's

Unfortunately, no information is given on why some physicians thought this.

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    Are you sure that the advice wasn't "do not breathe in toilet smells"? That woud be consistent with miasma theory, which was then current. – sempaiscuba Oct 15 '17 at 13:17
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    @sempaiscuba. Yes, I'm sure - that's why I'm puzzled. As you implied, it seems to contradict miasma theory and also the use of pomanders - the latter make sense, the former doesn't. – Lars Bosteen Oct 15 '17 at 13:31
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    Coming from HNQ, I thought this was posted on Medical Sciences considering the same site icon.... probably a history on health issue :) – Andrew T. Oct 15 '17 at 19:50
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    Could this be an archaic or otherwise obscure (to the modern reader) definition of toilet -- such as "denoting articles used in the process of washing and dressing oneself" -- and thus an encouragement to breathe pleasant smells associated with cleanliness? Eau de toilette, literally "toilet water," stands in stark contrast to commode water. – Michael - sqlbot Oct 15 '17 at 21:08
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    Try reading "Century of the surgeon" by Jurgen Thorwald. It's quite an eye opener, considering the fact it describes previous century, not centuries ago. – Agent_L Oct 15 '17 at 21:27
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This cannot be answered comprehensively here. But a few key points might be revealed. The precautions mentioned in the question are by far not the only ones that were given, just mere examples.

At the time, medical and lay authorities throughout Europe sought to give rational explanations for the virulent plague, which was clearly contagious. They issued many treatises trying to explain to the public the causes, symptoms, and treatment of the disease, which was in general blamed on celestial, terrestrial, and miasmatic facts as well as contagion (transference from infected persons). The plague was attributed to any and all of the following: corrupted air and water, hot and humid southerly winds, proximity of swamps, lack of purifying sunshine, excrement and other filth, putrid decomposition of dead bodies, excessive indulgence in foods (particularly fruits), God’s wrath, punishment for sins, and the conjunction of stars and planets. [emphasis added]
From George Childs Kohn: "Encyclopedia of Plague and Pestilence: From Ancient Times to the Present", Facts On File: New York,3rd2008, p. 31-33.

The prevailing theories to consider are hippocratic humoralpathology (humorism); that is: imbalances of juices cause illness and re-balancing them cures the illness. Applied to the theory of miasmas that means avoiding bad air is best, but using good smells can also re-balance the causative principle of the badness. Toilet smell is just a subtype of miasma (roughly "bad airs") coupled with the widely held belief that food is concocted and rotting in the process of digestion. The Black Death is indeed partly airborne when the infection is bubonic plague with lung involvement.

Concerning to actually "breathe in toilet smells to avoid the plague": this was indeed a desperate attempt to fight fire with fire. But a rare one. The principle of "And whoever smells you also gets it." (p 51) was the prevailing theory adhered to. (cited from Samuel K. Cohn: "Cultures of Plague: Medical Thinking at the End of the Renaissance", Oxford University Press, Oxford, 2010; listing countless examples across Europe for bad smells to avoid.)

This theory in favour of bad smells had some supporters of a certain calibre:

The smells did not have to be sweet; any strong smell might serve the purpose. Smoking or chewing tobacco was thought to bring immunity. In the 18th century it was said that the cess-pits in London had been opened during the Great Plague in an attempt to ward off the disease. In 1665 Dr Francis Glisson recommended as his ‘constant antidote’ a piece of dried manure of someone who had died of the disease, kept in a house in a porous box for ‘the best antidotical perfume’. Many of the nostrums and antidotes were unconvincing, and this one in particular sounds like the advice of a crank or at least an eccentric, but Glisson was a Cambridge man, who was Regius Professor of Physic for more than 40 years, a Fellow of the College of Physicians and an original fellow of the Royal Society.
Stephen Porter: "Disease and the City 17th Century: Plague", Gresham College Lecture, 2001.

This was a minority opinion and only fashionable for a time.

By far the most widely accepted cause of the plague, however, was foul odour caused by putrefaction. In the words of a medieval alchemical poem: "And when evyl substance shal putrefie Horrible odour // are gendered therbye // As of dragons, and men that long dead be, // Their stinke may cause great mortalitie."
[cited from Constance Classen, David Howes and Anthony Synnott: "Aroma – The cultural history of smell", Routledge, London, New York, 1994, p 59.]

But also note the emergence of principles as forerunners of Paracelsus and Hahnemann's homeopathy (similia similibus curator):

In fact, the fumes may not have purified “corrupted air,” but they would have acted as a stimulant and made a patient feel better. Others believed in battling stink with stink, a variation on the poison-versus-poison tactic advocated by later Paracelsians. This distinctly minority view advocated the use of nasty-smelling matter, including buckets of human waste, or the burning of foul-smelling materials like sulfur, leather, gunpowder, or human hair. Fire alone was also considered effective in purifying the air, whether in or out of doors. In 1348 papal physician Guy de Chauliac had Clement VI sit between two great fires in the main hall of his palace in Avignon for this very purpose. Fire’s natural drying effect counteracted the vile humidity that, he believed, sustained the corruption.
[cited from Joseph Patrick Byrne: "Daily life during the Black Death", Greenwood Press: Westport, 2006, p 49.]

More in line with current thinking would of course be the notion that once you combine bad aroma as cause for illness with the insight that for certain illnesses some survivors develop a level of immunity. It can hardly be argued that the concept would have been totally new to medieval doctors:

The Athenian epidemic of 430-426 BC, […] In his remarkable documentation of the epidemic, Thucydides (who survived the disease) not only left us a clear clinical picture of the pestilence but also identified its infectious nature and the fact that it conferred at least partial immunity on survivors.

This should not be read as as some form of thinking that lead to vaccinations but more like some kind of resistance training: What doesn't kill you makes you stronger.

Counteracting bad with bad is largely discredited by now, but it is not entirely unreasonable for seeing the deficiencies of effect of the other guidelines and then trying to do just the opposite. While those remedies that are outlined in this answer and which might be read as "they work": they did not always work and 'mis-applying' some apparent principles will have added to that.

Sleeping on your back was thought to be associated with sudden infant death – and is now associated with late still births. A nice empircal observation is that people primarily sleeping on their back tend to snore, get apneas and do not wake up as rested as others. Sleeping on one's back is therefore generally unhealthy and best to be avoided as a general health advice.

Bad air, the wrong type of food, lack of sleep, too much blood, or fright could affect the balance of humors and cause disease. Relocation to a place with good air, a diet of the right food, sound sleep, phlebotomy (controlled bleeding), or soothing music could heal. This matrix was the heart of Galenic medicine, which served as the model for Arabic, Byzantine, and western European medical theory and practice over nearly two millennia.
[cited from: Byrne/Aroma, p 17, emphasis added.]

Notice that 'sweet smells' is what inspired the design of this mask: Doktorschnabel This is not intended as a particulate filter but the beak is filled with herbs, spices and oils. An unintended consequence of this gear is that not only the transmission vector of fleas carrying the Yersinia pestis have a harder time to get to the wearer. Another is that also the directly airborne infectious droplets are filtered and some of the ingredients providing aroma might actually have had a bit of antibacterial like effect. The plague doctor Notradamus is reported to have used a mixture consisting of rose petals, cypress, iris, cloves, calamus, tiger lily and aloes. Tiger lily as an antibiotic? Another unintended discovery might be possible there.

tl;dr

Any religious significance might be added on top of that. But the core is a long standing tradition of empirical science. There was the observation, there was the theory and it often seemed to work according to theory. (Please do not judge this on any post-Galilaen concepts, it's history of science.) There was some apparent contemporary evidence that this worked and there is modern evidence that the advice given in these writings was not entirely hopeless, despite the desire to paint it as peculiar and even ridiculous.

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    At a museum in Scotland we visited, they made the point that the costume shown above actually worked. The getup made it nearly impossible to get bitten by the fleas that transmitted the plague, so it produced a noticeable reduction infections for the wearer, thus actually providing (wrong) evidence for the idea of a miasma being the cause. – Steven Burnap Oct 15 '17 at 16:32
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    The gown was waxed canvas, and the dress included leather gloves, waxed leather leggings, etc. Basically it left the doctor with no exposed skin. – Steven Burnap Oct 15 '17 at 16:54
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    That outfit is my favorite example of how things that look to as as ridiculous, irrational and superstitious were actually entirely rational and scientific when viewed with only the knowledge of the time. – Steven Burnap Oct 15 '17 at 16:56
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    A great answer, not least because of all the sources cited. – Lars Bosteen Oct 15 '17 at 23:42
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    "Sleeping on your back is associated with sudden infant death . . . . Sleeping on ones back is therefore generally unhealthy and best to be avoided as a general health advice." No, no, no! SLEEPING ON THE STOMACH is associated with SIDS; infants should sleep face up to reduce the risk of death. I'm sorry to shout, but this is literally a matter of life and death. – 1006a Oct 16 '17 at 6:22
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Possible reason for the 'toilet smells': Toilet smells were used to keep fleas out of cloaks.

From the Wikipedia entry for 'garderobe', a type of castle toilet: A description of the garderobe at Donegal Castle indicates that while it was in use, it was believed that ammonia would protect visitors' coats and cloaks, particularly from fleas.[4]

If this actually worked, I suppose that going around smelling like a garderobe might offer some plague protection, provided that the garderobe wasn't used by anyone with the plague O_o

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