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Si le yoga est une discipline qui vise le corps & l'esprit, l'insomnie est un trouble qui, fort probablement, trouve son origine là, quelque part... 
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Pour une mise à plat de cette histoire de "corps & esprit", je vous ai préparé un exposé d'une page ici, si vous êtes curieu.x.se.

Pour le principal, je vous ai annoncé 3 dimensions:
  • Dimension "mentale" liée à notre fonctionnement de personne consciente
  • Dimension "sensationnelle" liée au corps
  • Dimension "nerveuse" liée à notre fonctionnement "électrique" (typé "corps électrique cybernétique" dans  mon exposé

Voici donc mon crédo de départ:
  1. La plupart d'entre nous se retrouve, si éveillé en pleine nuit, assaillit par un tourbillon de ressassements, des tracas en boucle, ... [Dimension mentale]
  2. Le travail sur le corps change cette dynamique et agit sur le mental [credo yoguique]. Le guide sera le côté "sensationnel" résultant des postures. [Dimension Sensationnelle]
  3. L'attention à la respiration, voire sa manipulation agit sur le mental [Dimension nerveuse & senstationnelle]
  4. Le son est une alternative à explorer [Dimension nerveuse & senstationnelle]




Autres resources

Pour les cas sévères et les amateurs d'exposés clairs, informés et nettoyés des small talks qui pullulent sur le sujet: l'excellent Paul Ingraham de pain Science: "The Insomnia Guide, Serious insomnia-fighting advice from a veteran of the sleep wars"

Extraits choisis:
"Some insomnia is caused by sleep disorders such as DSPS, sleep apnea, or (seriously) narcolepsy.21 Or sleep loss may be caused by the pain of another medical condition, such as rheumatoid arthritis. But a great deal of insomnia is basically just a bad habit — a learned behaviour, which is usually aggravated into a crisis by emotional stresses22 or by other medical problems. This kind of insomnia is called “behavioural insomnia.”"

"Behavioural conditioning: Learning to sleep again is something like training a dog: endless repetition, and positive reinforcement. Only instead of doggy biscuit rewards … your reward is sleep.
Saying that behavioural insomnia is just a bad habit is like saying that cancer is just a few bad cells. Habits are the most powerful forces in our lives. Learned adaptation is one of the basic organizing principles of our nervous systems. Going up against that is never going to be easy".

"How long will it take? Some improvements in sleep hygiene combined with sleep compression therapy alone will resolve behavioural insomnia for most people within 4-6 weeks".
 
Pour les amateur.e.s d'émission Santé, perspective large et journalistique: "Troubles du sommeil : la fin du cauchemar ? - Enquête de santé le documentaire"
Et la partie interventions d'experts & questions/ réponses, suite au documentaire.
Pour les esprits scientifiques, quant à la question du "sport" et de l'insomnie:

https://jamanetwork.com/journals/jamainternalmedicine/article-abstract/209315
...generally no significant differences in response between morning and late-afternoon exercise.
...regular activity at least once a week, participating regularly in an exercise program, and walking at a normal pace for more than 6 blocks per day. Reduced risk of any sleep disorder was associated with regular activity at least once a week, and for men, walking at a brisk pace for more than 6 blocks.

Conclusions  These data provide additional evidence that a program of regular exercise may be a useful therapeutic modality in the treatment of patients with sleep disorders.
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https://www.sciencedirect.com/science/article/abs/pii/S1389945711002553
Conclusion: Long-term moderate aerobic exercise elicited significant improvements in sleep, quality of life and mood in individuals with chronic primary insomnia.

Conclusions  These data provide additional evidence that a program of regular exercise may be a useful therapeutic modality in the treatment of patients with sleep disorders.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3370319/
Exercise is effective to decrease sleep complaints and treat chronic insomnia
Pour les yoguistes, une ressource utile pour les postures de récupérations, mise en page par Witold Fitz-Simon, à tester dans ce protocole:

http://www.yogaartandscience.com/poses/restpos/restpos.html