6. Broccoli
Broccoli is a cruciferous vegetable that is packed with nutrition. It should absolutely be a regular part of your diet. However, broccoli also contains a lot of fiber which can take a long time to digest.
In fact, all cruciferous veggies are notorious for causing gas during digestion; other examples include Brussels sprouts, cabbage, kale, cauliflower, and collard greens. Snacking on any of these before bed is likely to keep you up.