English translation of the first study reporting cyclical periods of increased respiration and eye and body motility during sleep in infants in 1926, with commentary.

"Disclosure Statement Financial Disclosure Statement: The translator and author of the commentary (KD) declares no conflicts of interest for this work of translation. The Denisova lab gratefully acknowledges support from the Simons Foundation Autism Research Initiative (SFARI) under Award Number 62646 (PI: Kristina Denisova) and National Institute of Mental Health of the National Institutes of Health under Award Number R01MH121605 (PI: Kristina Denisova), and faculty start-up funds from the City University of New York, Queens College. The content is solely the responsibility of the author and does not necessarily represent the official views of the National Institutes of Health. The sponsors had no role in study design, in the collection, analysis, and interpretation of data, in the writing of this report, and in the decision to submit the manuscript for publication. Nonfinancial Disclosure Statement: The translator and author of the commentary (KD) declares no conflicts of interest for this work of translation. This work was carried out in the absence of any relationships which could be perceived as a potential conflict of interest. The author knows of no familial relationship. Financial Disclosure Statement: The translator and author of the commentary (KD) declares no conflicts of interest for this work of translation. The Denisova lab gratefully acknowledges support from the Simons Foundation Autism Research Initiative (SFARI) under Award Number 62646 (PI: Kristina Denisova) and National Institute of Mental Health of the National Institutes of Health under Award Number R01MH121605 (PI: Kristina Denisova), and faculty start-up funds from the City University of New York, Queens College. The content is solely the responsibility of the author and does not necessarily represent the official views of the National Institutes of Health. The sponsors had no role in study design, in the collection, analysis, and interpretation of data, in the writing of this report, and in the decision to submit the manuscript for publication. Nonfinancial Disclosure Statement: The translator and author of the commentary (KD) declares no conflicts of interest for this work of translation. This work was carried out in the absence of any relationships which could be perceived as a potential conflict of interest. The author knows of no familial relationship."

"Funding The Denisova lab gratefully acknowledges support from the Simons Foundation Autism Research Initiative (SFARI) under Award Number 614242 (PI: Kristina Denisova), National Institute of Mental Health of the National Institutes of Health under Award Number R01MH121605 (PI: Kristina Denisova), and faculty start-up funds from the City University of New York, Queens College. The content is solely the responsibility of the translating author (KD) and does not necessarily represent the official views of the National Institutes of Health. The sponsors had no role in study design, in the collection, analysis, and interpretation of data, in the writing of this report, and in the decision to submit the manuscript for publication. The author declares no conflicts of interest, either financial or nonfinancial, related to this work."