The term "functional disorders" gathers together the set of symptoms that have no clearly identifiable medical cause (on the opposite of lesional disorders which express an "organic" disease).
That diagnosis, called "eliminatory", is difficult because it is only carried out at the issue of expensive check-ups imposed by the "obligation of means" (stated in the deontological code).
Here, despite the pain and handicap, the complementary examinations are not contributive and the "symptomatic" treatments are often deceiving.
This failure of the "biomedical" logics in front of worrying, disabling and capricious symptoms leads to the implication of "stress" and psycho-somatic or alternative theories but the role of sleep remains widely underestimated, all the more since the natural evolution (apart from "iatrogenic disorders") is very favorable.
"These "bad" sick people who always hurt somewhere ..." ;
"These "good" sick people who want an a bit too long prescription..."
On 1 000 adults, 800 present symptoms, 327 think about seeing a doctor, and 217 really do, in first intention medicine, 13 ckeck-in in emergency room, and 8 are hospitalized.
These characteristics are common with the data issued from sleep research where everything looks as though the decompensation of a lack of sleep efficiency expresses physically through a functional disorder, which we suggest to describe as a "somnosomatic" symptom.
(They are described as "ubiquitary")
Besides, that failure of conventional medicine (the absence pf results of the "hippocratic model" : a symptom expresses a lesion), explains the mistrust of the patient and his/her fascination for the socalled "alternative" medicines.
Listening more to these really sick people, the pseudo-sciences do not, objectively, reveal more to be efficient but some subjects find some real "relief" in them because it is preferable to invent a pseudo-answer than to sink into despair.
Migraine, colopathy, chronic lumbalgy, stiff neck, palpitations and tinnitus (etc.) spontaneously disappear with age (they are no longer causes of consultation in old people’s homes).
sleep disorders are of very different kinds, in concordance with the stage of the illness, but the sensation that sleep is no longer "restful" translates the feeling, that is common to the sick persons.
This term describes the constant need of lying down to get rest every time it is possible. We observe that the tired subjects feel particularly "forced to settle down" at moments of the day which are paradoxically in counterphase with the "natural gates to sleep" (these "sleep gates") which correspond to physiological reductions of arousal and body temperature).
It is necessary to insist, here, on the essential differences that exist between the sensation of "sleepiness" and that of "tiredness". The scales that are used in sleep medicine to measure their respective intensities do not at all contain the same items.(See the "tests").
Fibromyalgia (an illness mentioned in the international classification of sleep disorders since 1992) is the subject of many scientific papers.
The sleep labs make studies in collaboration with the businesses that are concerned by atypical work rythms (aviation, transport, military ...).
The people who face time zone changes in repeated transmeridian flights (airline pilots, air hostesses, stewards) suffer of an identical chart : the «jet lag» syndrome.
In our opinion, most of the functional disorders encountered in general medicine are related to a problem of sleep inefficiency.
The concept of "hypo-sleep" that we introduce here stipulates that sleep is the engine of the illness. A perturbation in sleep efficiency would show through the appearance of functional disorders in a row of successive charts, quite stereotypical, going from the simple seeking for tonics to the chronic fatigue syndrome.
This point of view has been put forwards since the first descriptions of the illness by Pr. Modolwsky (1981) and it can be observed in the case of "jet lag". 
There seems to exist a true physiopathological continuum between the first functional disorders (signs of tiredness) and the apparition of more worrying symptoms like Fibromyalgia, «spasmophilia» attacks and/or chronic fatigue.
This concept sets the basis of "somnicology" : the application of the rules of sleep and chronobiology medicine to the understanding and taking care of functional disorders.
Taking elements of sleep hygiene and balance is a therapeutic alternative susceptible to help the sick people to understand better a large number of their symptoms.
The efficiency of the caretaking relies on the understanding of the mechanisms of sleep.
A step of the patient’s education ("learn to sleep") is indispensable befor using "somnications" (the medications of sleep : light, sport, pleasure, heat) capable to influence the settings of the sleep’s balance.
The nap) is, here, rather contraindicated (on the opposite of excessive daytime sleepiness situations).
This care approach, centered on chronobiology, places the doctor-patient relationship on a more pragmatic and efficient collaboration ground than that of the placebo medication or conforting words.
That approach is still used too often in these functional pathologies, considered as "benign", but which witness for a real problem of tiredness and carry in them the germs of insomnia.
 NB. The "hypo-sleep syndrome" is not an official and validated medical term.
It is one of the neologisms that we suggest to fill some vocabulary gaps in sleep medicine.
 The Alpha-Delta sleep is not specific to fibromyalgia patients. It has been observed in other situations (in subjects who lacked sleep or with depression).
This type of result is therefor no sufficient criteria for a diagnosis but should guide the patient in the direction of sleep medicine.
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 The chicken or the egg?
In the actual medical litterature, the "sleep disorders" are often mentioned amongst the list of clinical signs "caused by" the illness.
According to that point of view, which we do not share, diseases like "Chronic Fatigue Syndrome", "Fibromyalgia" or "Depression" would be the root of a sleep disorder (insomnia or sleepiness?).
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