People who skip meals often lack energy. People whose meals aren’t balanced -- maybe too high in carbohydrates and snack-type foods -- don’t have long-lasting energy. Always have protein and fiber with your meals and snacks because they slow down the rate of digestion, keeping you fuller longer and keeping energy levels higher or more stable than if you eat junk food. Foods like sodas, candies, and sweets are full of sugar, which is 100% energy but is really short-lived.
I suggest breakfast, lunch, dinner, and a midmorning and midafternoon snack. A normalized eating pattern is best for maintaining healthy weight and energy levels. Try to eat every three hours, and don’t eat at all after dinner. There’s no reason to fuel up to go to bed.