In a 16-oz or bigger jar, combine the coconut milk, chia seeds, honey, and vanilla extract (if using). Mix well until evenly distributed.
Seal the jar and refrigerate overnight, at least 8 hours, until the mixture thickens into a scoopable, pudding-like consistency.
Give the pudding a good stir before serving. Spoon over a fruit cup, or layer over Greek yogurt with granola for extra crunch and sweetness.