Yoga Sūtra Chapter One verse 10
अभावप्रत्ययालम्बना तमोवृत्तिर्निद्र ॥१०॥
abhāva-pratyaya-ālambanā tamaḥ vṛttiḥ nidrā ||10||
Deep sleep is the fluctuation of obscuring,
supporting a non-appearance of psychic activity.
Commentaries and Reflections
Commentary by T Krishnamacharya:
“Nidrā or deep sleep is the state in which the
mind’s link with external stimuli is cut off.
In this state, Tamas is dominant.
Although in deep sleep the mind
has no link with anything external,
this does not exclude all links,
which is why we are often able to recall
whether our sleep was sound or disturbed.”
Commentary by TKV Desikachar:
Commentary by Paul Harvey:
“Deep sleep is the obscuring of the fluctuations,
resulting in the non-appearance of mental activity.”
“In Sūtra 1.10 Patañjali defines Nidrā as a
Citta Vṛtti or, a specific type of cognition, one
where Tamas is the object, to the point where
the mind’s link with external stimuli is cut off.
How do we discern between states such as
Pratyāhāra as a disengagement, or Samādhi,
where one is as if empty of one’s own character,
and what is seen as the experience of Tamo Nidrā?”
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