Warming up for sleep? — Ground squirrels sleep during arousals from hibernation

@article{Daan1991WarmingUF,
  title={Warming up for sleep? — Ground squirrels sleep during arousals from hibernation},
  author={Serge Daan and B. Barnes and Arjen M. Strijkstra},
  journal={Neuroscience Letters},
  year={1991},
  volume={128},
  pages={265-268}
}
Hypothermia during mammalian hibernation is periodically interrupted by arousals to euthermy, the function of which is unknown. We report that arctic ground squirrels (Spermophilus parryii) consistently sleep during these arousals, and that their EEG shows the decrease in slow wave activity (delta power) that is characteristic of a declining requirement for sleep. These results are consistent with the novel hypothesis that the need for sleep slowly accumulates during torpor, and that returning… Expand
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Citation Type

Sleep EEG after daily torpor in the Djungarian hamster: similarity to the effects of sleep deprivation
TLDR
It is demonstrated in the Djungarian hamster that EEG slow-wave activity (EEG power density in the 0.75-4-Hz range), which is increased after SD, is enhanced in a similar way after an episode of daily torpor, supporting the hypothesis that daily torpora is incompatible with the restorative function of sleep. Expand
Sleep after arousal from hibernation is not homeostatically regulated.
TLDR
Findings indicate that the SWA peak immediately after hibernation does not represent homeostatic regulation of NREM sleep, as it normally does after prolonged wakefulness during euthermia, but instead may reflect some other neurological process in the recovery of brain function from an extended period at low temperature. Expand
Sleep after arousal from hibernation is not homeostatically regulated.
  • Jennie Larkin, H. Heller
  • Psychology, Medicine
  • American journal of physiology. Regulatory, integrative and comparative physiology
  • 1999
TLDR
Findings indicate that the SWA peak immediately after hibernation does not represent homeostatic regulation of NREM sleep, as it normally does after prolonged wakefulness during euthermia, but instead may reflect some other neurological process in the recovery of brain function from an extended period at low temperature. Expand
Cool hamsters get sleepy
TLDR
The data indicate that an important function of sleep cannot be fulfilled during the torpid state, a finding which may give additional insights into the processes involved in sleep regulation. Expand
The disappearing slow wave activity of hibernators.
TLDR
It is suggested that the SWA following arousal from hibernation does not represent homeostatic regulation of NREM sleep, but instead some other neurological process involved in the recovery of brain function from an extended period at low temperature. Expand
The disappearing slow wave activity of hibernators.
TLDR
It is suggested that the SWA following arousal from hibernation does not represent homeostatic regulation of NREM sleep, but instead some other neurological process involved in the recovery of brain function from an extended period at low temperature. Expand
Cold arousal - A mechanism used by hibernating bats to reduce the energetic costs of disturbance
TLDR
Temperature data loggers were used to register the skin temperature of 38 Myotis myotis bats over two winters (between January and March), during which regular visits were made to the hibernaculum, and two kinds of arousal were observed. Expand
The Djungarian Hamster Is Sleep Deprived during Daily Torpor
Sleep, daily torpor and hibernation are thought to be homologous processes. However, non-rapid eye movement sleep (NREM) sleep after daily torpor in the Djungarian hamster, or during euthermic… Expand
Hibernation in a primate: does sleep occur?
TLDR
Electroencephalographic recordings, temperature data and metabolic rates from two related species inhabiting high-altitude rainforests and hibernating underground and compared the physiology of hibernation and spontaneous arousals in these animals to C. medius, finding a number of commonalities with non-primate temperate hibernators. Expand
The Relationship of Sleep with Temperature and Metabolic Rate in a Hibernating Primate
TLDR
Findings confirm a sleep-temperature/metabolism link, though they also suggest that the relationship of sleep stage with temperature/metabolic-rate is flexible and may differ across species or mammalian orders. Expand
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References

SHOWING 1-10 OF 23 REFERENCES
Neuronal activity during sleep and complete bouts of hibernation.
TLDR
The results extend previous observations that hibernation is not a homogeneous state and suggest that deep torpor consists primarily of a state similar to NREM sleep, interrupted periodically by short intervals of a form of AW. Expand
Sleep and hibernation in ground squirrels (Citellus spp): electrophysiological observations.
TLDR
It was concluded that the entrance into hibernation represents an extension of the thermoregulatory adjustments that occur during SWS. Expand
Sleep and hypometabolism
TLDR
Bouts of torpor, hibernation, or nocturnal hypothermia consist mostly of SWS, and these states involve a downward resetting of hypothalamic thermosensitivity in mammals and spinal thermos sensitivity in avian thermoregulatory systems. Expand
Comparative aspects of energy metabolism, body temperature and sleep.
Comparative studies of energy metabolism, thermoregulation and sleep indicate that down-regulation of hypothalamic thermosensitivity and metabolic rate is initiated at sleep onset and extended as… Expand
Comparative aspects of energy metabolism, body temperature and sleep.
Comparative studies of energy metabolism, thermoregulation and sleep indicate that down-regulation of hypothalamic thermosensitivity and metabolic rate is initiated at sleep onset and extended as… Expand
Cyclic changes in carbohydrate concentrations during hibernation in the arctic ground squirrel.
TLDR
Plasma glucose, and glycogen in liver and thigh muscle declined steadily during each hibernation period, but glycogen concentrations in kidney, brown fat, and heart did not change, and it is suggested that these declines may directly initiate arousal in this species. Expand
Freeze avoidance in a mammal: body temperatures below 0 degree C in an Arctic hibernator.
TLDR
Hibernating arctic ground squirrels were able to adopt and spontaneously arouse from core body temperatures as low as -2.9 degrees C without freezing and plasma sampled from animals with below 0 degree C body temperatures had normal solute concentrations and showed no evidence of containing antifreeze molecules. Expand
Timing of human sleep: recovery process gated by a circadian pacemaker.
TLDR
The model shows that the experimental data are consistent with the concept of a single circadian pacemaker in humans, which has implications for the understanding of sleep as a restorative process and its timing with respect to day and night. Expand
Time patterns and metabolic rates of natural torpor in the Richardson's ground squirrel
TLDR
Using radiotelemetry for body-temperature sensing in field animals, torpor season in the Richardson's ground squirrel was found to commence from mid-July in adults and mid-September in juveniles and to terminate for both groups in mid-March. Expand
The influence of hibernation on testis growth and spermatogenesis in the golden-mantled ground squirrel, Spermophilus lateralis.
TLDR
It is suggested that males are normothermic for several weeks before they emerge from their hibernacula in the spring, and the major portion of gonadal growth and spermatogenesis in the laboratory, and presumably in the field, occurs after ground squirrels have regained thenormothermic state. Expand
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