Yoga Sutras of Patanjali 1.6

प्रमाणविपर्ययविकल्पनिद्रास्मृतयः ॥

pramana-viparyaya-vikalpa-nidra-smritayah

They are right knowledge, wrong knowledge, imagination, sleep, and memory.

वे हैं — प्रमाण, विपर्यय, विकल्प, निद्रा और स्मृति।