योगवासिष्ठः yogavāsiṣṭhaḥ - book-6, chapter-51, verse-54

कदाचिद्धि सुषुप्तस्थः कदाचित्स्वप्नवत्स्थितः ।
आतिवाहिकदेहोऽयं सर्वस्यैवावतिष्ठते ॥ ५४ ॥

kadāciddhi suṣuptasthaḥ kadācitsvapnavatsthitaḥ ,
ātivāhikadeho'yaṃ sarvasyaivāvatiṣṭhate 54

54. kadācit hi suṣuptasthaḥ kadācit svapnavat sthitaḥ
ayam ātivāhikadehaḥ sarvasya eva avatiṣṭhate

54. ayam ātivāhikadehaḥ sarvasya eva avatiṣṭhate hi
kadācit suṣuptasthaḥ kadācit svapnavat sthitaḥ

54. This subtle, transitional body (ātivāhikadeha) always exists for everyone; sometimes it is in the state of deep sleep, and sometimes it is like a dream.

Words meanings summery:

• कदाचित् (kadācit) - sometimes, at some time

• हि (hi) - indeed, surely

• सुषुप्तस्थः (suṣuptasthaḥ) - situated in deep sleep

• कदाचित् (kadācit) - sometimes, at some time

• स्वप्नवत् (svapnavat) - like a dream, dream-like

• स्थितः (sthitaḥ) - situated, standing, existing

• अयम् (ayam) - this

• आतिवाहिकदेहः (ātivāhikadehaḥ) - subtle body, transitional body

• सर्वस्य (sarvasya) - of all, for all, of everyone

• एव (eva) - indeed, only, just, quite

• अवतिष्ठते (avatiṣṭhate) - exists, remains, stands

Words meanings and morphology

कदाचित् (kadācit) - sometimes, at some time

(indeclinable)

हि (hi) - indeed, surely

(indeclinable)

सुषुप्तस्थः (suṣuptasthaḥ) - situated in deep sleep

(adjective)

Nominative, masculine, singular of suṣuptastha

suṣuptastha - being in deep sleep, situated in deep sleep

Compound type : tatpuruṣa (suṣupta+stha)

• suṣupta – deep sleep, fast asleep
  noun (neuter)
  Past Passive Participle
  From √svap (to sleep), with prefix su- and irregular formation
  Prefix: su
  Root: svap (class 2)
• stha – standing, staying, situated in
  adjective (masculine)
  From √sthā (to stand)
  Root: sthā (class 1)

कदाचित् (kadācit) - sometimes, at some time

(indeclinable)

स्वप्नवत् (svapnavat) - like a dream, dream-like

(indeclinable)

From svapna (dream) with suffix -vat (like)

स्थितः (sthitaḥ) - situated, standing, existing

(adjective)

Nominative, masculine, singular of sthita

sthita - standing, situated, existing, abiding

Past Passive Participle

From √sthā (to stand)

Root: sthā (class 1)

अयम् (ayam) - this

(pronoun)

Nominative, masculine, singular of idam

idam - this

Note: Refers to `ātivāhikadehaḥ`.

आतिवाहिकदेहः (ātivāhikadehaḥ) - subtle body, transitional body

(noun)

Nominative, masculine, singular of ātivāhikadeha

ātivāhikadeha - subtle body; transitional body; vehicle body (that carries the soul from one physical body to another)

Compound type : tatpuruṣa (ātivāhika+deha)

• ātivāhika – serving for conveyance, conveying, transitional
  adjective (masculine)
  From ati-√vah (to carry beyond)
  Prefix: ati
  Root: vah (class 1)
• deha – body, form
  noun (masculine)

सर्वस्य (sarvasya) - of all, for all, of everyone

(pronoun)

Genitive, masculine, singular of sarva

sarva - all, every, whole

एव (eva) - indeed, only, just, quite

(indeclinable)

अवतिष्ठते (avatiṣṭhate) - exists, remains, stands

(verb)

3rd person , singular, middle, present indicative (laṭ) of avasthā

From ava-√sthā (to stand down)

Prefix: ava

Root: sthā (class 1)

Note: Pāṇinian dhātupāṭha suggests *sthā* is *ātmanepada* with *ava*.