所以相对来讲，是否保证核心睡眠是没有必要的。

Other people say that REM sleep is the only essential phase of sleep, so core sleep isn't necessary.

youdao

核心睡眠的增加也带来了和Uberman计划的其它不同。

The addition of the core naps causes some other differences from the Uberman schedule as well.

youdao

例如，您可以安排一个从凌晨2点到5点的核心睡眠阶段，然后其余的时间进行3到4次小睡。

For example, you might have a core sleep period from 2-5am, and then three or four shorter naps spread throughout the day.

youdao