Abstract
Wakefulness-sleep patterns of male rats belonging to the Roman strains were studied under two environmental conditions: (1) Over 5 hr (12 a.m.–5 p.m.) and following an adaptation period of 18 hr (Short Adaptation condition, SA); (2) Over 23 hr and following an adaptation period of 168 hr (Long Adaptation condition, LA). Several significant differences appeared in the SA condition. In particular, the total duration of wakefulness was shorter and that of paradoxical sleep, longer in the Roman High Avoidance strain than in the Roman Low Avoidance strain. No significant difference appeared in the LA condition, neither over the whole nycthemeral cycle nor during the 12 a.m.–5 p.m. period. According to these findings, the genetic factors that distinguish the Roman strains seem most likely to concern habituation to a new environment rather than to control specifically the sleep-wakefulness phenomena.
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