Pratyahara (Crystalization)

svavishaya asanprayoge chittasya svarupanukara iv endriyanam pratyaharah
स्वविषयासंप्रयोगे चित्तस्य स्वरूपानुकारैवेन्द्रियाणां प्रत्याहारः
Abstraction (Pratyāhāraḥ) is that by which the senses do not-come-into-contact with their objects and follow as-it-were the nature of the mind.

tatah parama vashyata indriyanam
ततः परमावश्यता इन्द्रियाणाम्
Thence the senses are under the highest control.

dharanasu cha yogyata manasah
धारणासु च योग्यता मनसः
And the fitness of the mind for concentration.
Pratyahara is the Complete withdrawal of the senses…….spontaneous, voluntary detachment of the senses from their sense-objects (like a tortoise) resulting in involution of the senses…….the journey inwards.

Techniques adopted
Kayasthairyam
Yoga Nidra