我们对睡眠功能和机制的理解仍然不完整，反映出它们日益明显的复杂性1,2,3。同样，对睡眠期间大脑半球间协调的研究4,5,6通常很难与已知的睡眠回路和机制精确联系起来。在这里，通过记录胡须龙 ( Pogona vitticeps ) 的睡眠，我们表明，尽管Pogona快速眼动 (REM P ) 和慢波睡眠的开始和偏移是双边协调的，但这两种睡眠状态不同明显地表现在它们的类群间协调上。在慢波睡眠期间，claustra 产生彼此独立的尖波涟漪，没有表现出协调性。相比之下，在 REM 期间P sleep，两个claustra产生的电位在幅度和时间上精确协调。然而，这些信号不是同步的：一侧超前另一侧约 20 毫秒，通常每个 REM P超前侧切换一次情节或连续情节之间。领先的屏状核表现出更强的活动，表明双边竞争。这种竞争不会直接发生在两个 claustra 或端脑半球之间。相反，它发生在中脑并且取决于峡部复合体的 GABAergic（产生 γ-氨基丁酸）核的完整性，它存在于所有脊椎动物中，并且已知在鸟类中是自下而上的注意力和注视控制的基础。这些结果表明， Pogona大脑两侧之间存在赢家通吃的竞争，这种竞争起源于中脑，对 REM P睡眠期间的屏状核活动和协调具有精确的影响。

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Our understanding of the functions and mechanisms of sleep remains incomplete, reflecting their increasingly evident complexity1,2,3. Likewise, studies of interhemispheric coordination during sleep4,5,6 are often hard to connect precisely to known sleep circuits and mechanisms. Here, by recording from the claustra of sleeping bearded dragons (Pogona vitticeps), we show that, although the onsets and offsets of Pogona rapid-eye-movement (REMP) and slow-wave sleep are coordinated bilaterally, these two sleep states differ markedly in their inter-claustral coordination. During slow-wave sleep, the claustra produce sharp-wave ripples independently of one another, showing no coordination. By contrast, during REMP sleep, the potentials produced by the two claustra are precisely coordinated in amplitude and time. These signals, however, are not synchronous: one side leads the other by about 20 ms, with the leading side switching typically once per REMP episode or in between successive episodes. The leading claustrum expresses the stronger activity, suggesting bilateral competition. This competition does not occur directly between the two claustra or telencephalic hemispheres. Rather, it occurs in the midbrain and depends on the integrity of a GABAergic (γ-aminobutyric-acid-producing) nucleus of the isthmic complex, which exists in all vertebrates and is known in birds to underlie bottom-up attention and gaze control. These results reveal that a winner-take-all-type competition exists between the two sides of the brain of Pogona, which originates in the midbrain and has precise consequences for claustrum activity and coordination during REMP sleep.