Mantra 18

स यत्रैतत्स्वप्न्यया चरति ते हास्य लोकाः ।तदुतेव महाराजो भवत्युतेव महाब्राह्मणः ।उतेवोच्चावचं निगच्छति ।स यथा महाराजो जानपदान् गृहीत्वा स्वे जनपदे यथाकामं परिवर्तेतैवमेवैष एतत्प्राणान् गृहीत्वा स्वे शरीरे यथाकामं परिवर्तते ॥२,१.१८ ॥

In plain words

And when he moves about in dream, those are his worlds. Then he is as it were a great king, or as it were a great brahmin; he goes as it were to high and low. And as a great king, taking his people with him, moves about in his own land as he pleases, so this one, taking the breaths with him, moves about in his own body as he pleases.