योगवासिष्ठः yogavāsiṣṭhaḥ - book-3, chapter-26, verse-51

त्रस्तक्षीबार्धनिद्राश्च नौयानाश्च सदैव स्ये ।
वेतालवनवृक्षादि पश्यन्त्यनुभवन्ति च ॥ ५१ ॥

trastakṣībārdhanidrāśca nauyānāśca sadaiva sye ,
vetālavanavṛkṣādi paśyantyanubhavanti ca 51

51. trastakṣībārdhanidrāḥ ca nauyānāḥ ca sadā eva
sye vetālavanavṛkṣādi paśyanti anubhavanti ca

51. trastakṣībārdhanidrāḥ ca nauyānāḥ ca sadā eva
sye vetālavanavṛkṣādi paśyanti anubhavanti ca

51. Those who are frightened, intoxicated, or half-asleep, as well as those traveling by boat, always see and experience phenomena like goblins, forests, and trees (which are not actually present).

Words meanings summery:

• त्रस्तक्षीबार्धनिद्राः (trastakṣībārdhanidrāḥ) - frightened, intoxicated, and half-asleep (people)

• च (ca) - and

• नौयानाः (nauyānāḥ) - those on a boat voyage, travelers by boat

• च (ca) - and

• सदा (sadā) - always, ever

• एव (eva) - indeed, only

• स्ये (sye) -

• वेतालवनवृक्षादि (vetālavanavṛkṣādi) - goblins, forests, trees, etc.

• पश्यन्ति (paśyanti) - they see

• अनुभवन्ति (anubhavanti) - they experience

• च (ca) - and

Words meanings and morphology

त्रस्तक्षीबार्धनिद्राः (trastakṣībārdhanidrāḥ) - frightened, intoxicated, and half-asleep (people)

(adjective)

Nominative, masculine, plural of trastakṣībārdhanidra

trastakṣībārdhanidra - one who is frightened, intoxicated, and half-asleep

Compound type : dvandva (trasta+kṣība+ardhanidra)

• trasta – frightened, terrified
  adjective (masculine)
  Past Passive Participle
  From root 'tras' (to tremble, to be afraid).
  Root: tras (class 1)
• kṣība – intoxicated, drunk, proud
  adjective (masculine)
• ardhanidra – half-asleep, drowsy
  adjective (masculine)

च (ca) - and

(indeclinable)

नौयानाः (nauyānāḥ) - those on a boat voyage, travelers by boat

(noun)

Nominative, masculine, plural of nauyāna

nauyāna - boat voyage, traveling by boat; one who travels by boat

Compound type : tatpurusha (nau+yāna)

• nau – boat, ship
  noun (feminine)
• yāna – going, journey, vehicle
  noun (neuter)
  Root: yā (class 2)

च (ca) - and

(indeclinable)

सदा (sadā) - always, ever

(indeclinable)

एव (eva) - indeed, only

(indeclinable)

स्ये (sye) -

(indeclinable)

वेतालवनवृक्षादि (vetālavanavṛkṣādi) - goblins, forests, trees, etc.

(noun)

Accusative, masculine, plural of vetālavanavṛkṣādi

vetālavanavṛkṣādi - goblins, forests, trees, and so on

Compound type : dvandva (vetāla+vana+vṛkṣa+ādi)

• vetāla – a goblin, ghost, vampire
  noun (masculine)
• vana – forest, wood, grove
  noun (neuter)
• vṛkṣa – tree
  noun (masculine)
• ādi – beginning, etcetera, and so on
  indeclinable

Note: Used here adverbially or as direct object of 'paśyanti' and 'anubhavanti'.

पश्यन्ति (paśyanti) - they see

(verb)

3rd person , plural, active, present (lat) of dṛś

Thematic present active voice, class 4 (paśyati stem).

Root: dṛś (class 4)

अनुभवन्ति (anubhavanti) - they experience

(verb)

3rd person , plural, active, present (lat) of anubhū

Thematic present active voice, 3rd person plural, from root 'bhū' with prefix 'anu'.

Prefix: anu

Root: bhū (class 1)

च (ca) - and

(indeclinable)