Declension table of ?suptastha

Neuter	Singular	Dual	Plural
Nominative	suptastham	suptasthe	suptasthāni
Vocative	suptastha	suptasthe	suptasthāni
Accusative	suptastham	suptasthe	suptasthāni
Instrumental	suptasthena	suptasthābhyām	suptasthaiḥ
Dative	suptasthāya	suptasthābhyām	suptasthebhyaḥ
Ablative	suptasthāt	suptasthābhyām	suptasthebhyaḥ
Genitive	suptasthasya	suptasthayoḥ	suptasthānām
Locative	suptasthe	suptasthayoḥ	suptastheṣu

Compound suptastha -

Adverb -suptastham -suptasthāt