Declension table of ?śayanāsana

Neuter	Singular	Dual	Plural
Nominative	śayanāsanam	śayanāsane	śayanāsanāni
Vocative	śayanāsana	śayanāsane	śayanāsanāni
Accusative	śayanāsanam	śayanāsane	śayanāsanāni
Instrumental	śayanāsanena	śayanāsanābhyām	śayanāsanaiḥ
Dative	śayanāsanāya	śayanāsanābhyām	śayanāsanebhyaḥ
Ablative	śayanāsanāt	śayanāsanābhyām	śayanāsanebhyaḥ
Genitive	śayanāsanasya	śayanāsanayoḥ	śayanāsanānām
Locative	śayanāsane	śayanāsanayoḥ	śayanāsaneṣu

Compound śayanāsana -

Adverb -śayanāsanam -śayanāsanāt