Verse 1.11

कार्यकारणबद्धौ ताविष्येते विश्वतैजसौ ।
प्राज्ञः कारणबद्धस्तु द्वौ तौ तुर्ये न सिध्यतः ॥ ११॥

kāryakāraṇabaddhau tāviṣyete viśvataijasau .
prājñaḥ kāraṇabaddhastu dvau tau turye na sidhyataḥ

It means “Viswa” i.e. Waker and “Taijasa” i.e. Dreamer are associated to Karanam (Cause) & Karyam (effect) where Ignorance is the cause and Error is the effect.

In deep sleep there is Ignorance but there is no error. The nature of dream may be different for You and me i.e. every individual has different types of dream and are not same .

The nature of deep sleep is same for all beings whether it is a mosquito or tiger or elephant or monkey or human being or PHD or any successful businessman or an illiterate person, it is same for all beings !!

The reason is in deep sleep there is ignorance i.e. complete darkness , nothing to illumine by Turiya the pure consciousness!

Usually we do not experience any thing in deep sleep but “Advaita Vedanta” says –

Do you experience the lack of experience in “deep sleep”?

When we wake up we always say “I had a sound sleep”.

“How do you know you had a sound sleep ? if you experienced nothing in deep sleep .. who tells you that , you had a sound sleep ?”

The ‘who’ here is ‘Turiya’ .

Since ‘Turiya’ is the witness to all of the deep sleep blankness , hence when we wakeup we say “I had a sound sleep” .

Actually Turiya is witnessing this information updating in our conscious and subconscious mind that we had sound sleep . So ,when we wake up we know we had a sound sleep . This proves that Turiya exists and we are the Pure conscious beyond this body & mind !

It means “Viswa” i.e. Waker and “Taijasa” i.e. Dreamer are associated to Karanam (Cause) & Karyam (effect) where Ignorance is the cause and Error is the effect.