Declension table of ?nirnidra

Neuter	Singular	Dual	Plural
Nominative	nirnidram	nirnidre	nirnidrāṇi
Vocative	nirnidra	nirnidre	nirnidrāṇi
Accusative	nirnidram	nirnidre	nirnidrāṇi
Instrumental	nirnidreṇa	nirnidrābhyām	nirnidraiḥ
Dative	nirnidrāya	nirnidrābhyām	nirnidrebhyaḥ
Ablative	nirnidrāt	nirnidrābhyām	nirnidrebhyaḥ
Genitive	nirnidrasya	nirnidrayoḥ	nirnidrāṇām
Locative	nirnidre	nirnidrayoḥ	nirnidreṣu

Compound nirnidra -

Adverb -nirnidram -nirnidrāt