nightgloom
Darkness of the night; night gloom.
literary, rare, uncountable
[…] how we longed to be the hero, how the burning ardour for adventure arose within us, and we sought wistfully with eager eyes to find somewhere in the world around the footprints of temerity, listening breathlessly even in the nightgloom for the sound of their creation, doubting not ‘the deeds that we would do or die.’
Where it comes from
Either from night + gloom or a learned borrowing from Old English nihtglōm,
Adapted from the Wiktionary entry nightgloom (CC BY-SA 4.0).