'People may see his playground but himself no one ever sees. Therefore they say, Let no one wake a man suddenly, for it is not easy to remedy, if he does not get back (rightly to his body)." 'Here some people (object and) say: "No, this (sleep) is the same as the place of waking, for what he sees while awake, that only he sees when asleep." No, here (in sleep) the person is self-illuminated (as we explained before).' Ganaka Vaideha said: 'I give you, Sir, a thousand. Speak on for the sake of (my) emancipation.'
In plain words: People can see the dream world, but no one ever sees the Self that makes it, so you should not wake a sleeper suddenly in case it does not return to the body properly. Some people say dreams only repeat what we see while awake, but Yajnavalkya says the dreamer shines by its own light. The grateful king gives him a thousand and asks him to keep teaching so he can become free.