"Carbs at Night Make You Gain Fat", explained simply
Your body doesn't store a carbohydrate differently just because of the clock. Total intake over time matters more; meal-timing research is still developing.
Evidence & sources
Body weight changes over time mainly reflect total energy intake versus expenditure. Evidence: moderate. Known: Mathematical modeling validated against controlled feeding studies. Unknown: Some studies suggest meal timing may affect appetite and blood glucose; this is still being researched. Source: Hall et al., The Lancet, Quantification of the effect of energy imbalance on bodyweight (2011).