प्रमाण-विपर्यय-विकल्प-निद्रा-स्मृतयः ॥

pramāṇa-viparyaya-vikalpa-nidrā-smṛtayaḥ

(These are) right knowledge, indiscrimination, verbal delusion, sleep, and memory.

In plain words: The five kinds of thought-waves are right knowledge, mistaken knowledge, ideas built only on words, sleep, and memory.