night meal; late-night snack; midnight snack
Refers to a meal or snack eaten late at night, typically after dinner. Can range from a light snack to a full meal, depending on context.
I ate ramen as a late-night snack.
I studied for the exam while having a midnight snack.
Compound of 夜 (ya, 'night') and 食 (shoku, 'meal'). The reading is on'yomi.