Night sleep of primates on the earth and during space flight on Cosmos-1667

G. G. Shlyk, V. S. Rotenberg, M. A. Shirvinskaya, V. I. Korolkov, V. S. Magedov

Research output: Contribution to journalArticlepeer-review


The data on the sleep structure of two rhesus monkeys, Vernyi and Gordyi, during their 7-day space flight on Cosmos-1667 and a control study staged a month after recovery are discussed. Sleep structure was changed to the greatest extent the night before launch when additional stress factors were involved. During the first night in space Vernyi showed the so-called recoil effect. Later his sleep structure became stabilized: the specific weight of fast sleep diminished and the fast sleep/delta/sleep index in the first two cycles decreased. In the ground-based control study, sleep parameters pointed to a deteriorated health status of the animal: his fast sleep patterns changed and delta-sleep often reached its maximum after a fast sleep episode. In this animal adaptation was associated with fast sleep restructuring. In the second primate, Gordyi, the process of adaptation was extended and took three nights. This animal consistently showed low parameters of delta-sleep during both fright and postflight control study; it exhibited no recoil phenomenon after its reduction in the prelaunch night. The structure of sleep indicated that it played a lesser role in the overall process of adaptation.

Original languageEnglish
Pages (from-to)12-17
Number of pages6
JournalAviakosmicheskaia i ekologicheskaia meditsina = Aerospace and environmental medicine
Issue number5
StatePublished - 1989


Dive into the research topics of 'Night sleep of primates on the earth and during space flight on Cosmos-1667'. Together they form a unique fingerprint.

Cite this