महाभारतः mahābhārataḥ - book-1, chapter-19, verse-13

अध्यात्मयोगनिद्रां च पद्मनाभस्य सेवतः ।
युगादिकालशयनं विष्णोरमिततेजसः ॥१३॥

13. adhyātmayoganidrāṁ ca padmanābhasya sevataḥ ,
yugādikālaśayanaṁ viṣṇoramitatejasaḥ.

13. adhyātmayoganidrām ca padmanābhasya sevatas
yugādikālaśayanam viṣṇoḥ amitatejasaḥ

13. They observed the spiritual yoga-sleep and the cosmic reclining at the beginning of the ages of Padmanābha, of Viṣṇu of immeasurable splendor, who experiences [this state].

Words meanings summery:

• अध्यात्मयोगनिद्राम् (adhyātmayoganidrām) - the divine yoga-sleep of Vishnu (spiritual meditative sleep, mystical trance)

• च (ca) - and (and, also)

• पद्मनाभस्य (padmanābhasya) - of Lord Vishnu (of Padmanābha (lotus-navelled))

• सेवतस् (sevatas) - of him who experiences (this state of yoga-sleep) (of him serving, of him attending, of him experiencing)

• युगादिकालशयनम् (yugādikālaśayanam) - the cosmic reclining of Vishnu at the beginning of the yugas (the lying down at the time of the beginning of the ages)

• विष्णोः (viṣṇoḥ) - of Lord Vishnu (of Vishnu)

• अमिततेजसः (amitatejasaḥ) - of Lord Vishnu, whose power is boundless (of immeasurable splendor/power)

Words meanings and morphology

अध्यात्मयोगनिद्राम् (adhyātmayoganidrām) - the divine yoga-sleep of Vishnu (spiritual meditative sleep, mystical trance)

(noun)

Accusative, feminine, singular of adhyātmayoganidrā

adhyātmayoganidrā - spiritual yoga-sleep, divine trance

Compound type : tatpuruṣa (adhyātma+yoga+nidrā)

• adhyātma – relating to the self or spirit, spiritual
  noun (neuter)
• yoga – union, discipline, meditation, spiritual practice
  noun (masculine)
• nidrā – sleep, slumber
  noun (feminine)

च (ca) - and (and, also)

(indeclinable)

पद्मनाभस्य (padmanābhasya) - of Lord Vishnu (of Padmanābha (lotus-navelled))

(noun)

Genitive, masculine, singular of padmanābha

padmanābha - lotus-navelled (an epithet of Vishnu)

Compound type : bahuvrīhi (padma+nābhi)

• padma – lotus
  noun (masculine/neuter)
• nābhi – navel
  noun (feminine)

सेवतस् (sevatas) - of him who experiences (this state of yoga-sleep) (of him serving, of him attending, of him experiencing)

(nominal form)

Genitive, masculine, singular of sevat

sevat - serving, attending, worshipping, experiencing

present participle

Derived from root sev (to serve) + śatṛ suffix.

Root: sev (class 1)

Note: Modifies 'Padmanābhasya' and 'Viṣṇoḥ'.

युगादिकालशयनम् (yugādikālaśayanam) - the cosmic reclining of Vishnu at the beginning of the yugas (the lying down at the time of the beginning of the ages)

(noun)

Accusative, neuter, singular of yugādikālaśayana

yugādikālaśayana - lying down/reposing at the time of the beginning of the yugas (cosmic ages)

Compound type : tatpuruṣa (yugādi+kāla+śayana)

• yugādi – beginning of an age/yuga
  noun (masculine)
• kāla – time
  noun (masculine)
• śayana – lying down, bed, sleep
  noun (neuter)

विष्णोः (viṣṇoḥ) - of Lord Vishnu (of Vishnu)

(noun)

Genitive, masculine, singular of viṣṇu

viṣṇu - Vishnu (name of a deity)

अमिततेजसः (amitatejasaḥ) - of Lord Vishnu, whose power is boundless (of immeasurable splendor/power)

(adjective)

Genitive, masculine, singular of amitatejas

amitatejas - having immeasurable splendor/power

Compound type : bahuvrīhi (amita+tejas)

• amita – immeasurable, boundless, infinite
  adjective (masculine/feminine/neuter)
• tejas – splendor, radiance, power
  noun (neuter)

Note: Modifies 'Viṣṇoḥ'.