overnighter

noun

1. A person who overnights, or stays overnight.

   “1981, Lou Sullivan, personal diary, quoted in 2019, Ellis Martin, Zach Ozma (editors), We Both Laughed In Pleasure I was totally unprepared (my "padding," my apartment) for an overnighter, but I invited him.”

   “Meanwhile, wildlife tourism has turned Knepp into a successful business that employs more people than it did when it was a farm. Springtime overnighters snuggling down in a luxury treehouse after a soak in the open-air, wood-fired Swedish Hikki bathtub may hear nightingales serenading their consorts”

2. Something that serves overnight travel, such as a night train.
3. (informal)A stay or event that takes place overnight.

   “To tackle the narrative challenge of Cave’s extreme isolation (for most of the winter he’s confined to a tiny hut, lacking even the sun for solace), Harding populates his solitude through reveries of his marriage to a Danish woman, whose pregnancy and calamitous labor make his own ordeal look, at least for a while, like an overnighter in the Adirondacks.”