When you reach the point while studying for finals when your eyes start to glaze over and words lose all meaning, grabbing the nearest sugar-loaded treat is expected. Your body is exhausted, your eyes are closing and you need something that’ll keep you going, if only for a few more hours before you inevitably crash.

As convenient as a vending machine snack at the library is, you might want to reconsider how you fuel your body.

Swapping in some common late-night snacks for a healthy alternative could just be the difference between falling asleep on your books and getting an A in a class.

Try this: Greek yogurt

It might not be the first snack you reach for, but Greek yogurt is packed with protein, low in sugar and will actually fill you up. If the plain variety isn’t for you, throw in some granola, honey or berries for more flavor.

Not this: pudding

Though one cup of pudding isn’t going to hurt you, it probably won’t help you either. Low-calorie pudding made out of fat free or skim milk provides calcium and nutrients such as Vitamin D, but also may contain sugar additives.

Try this: pretzels

In contrast to other savory snack foods, pretzels contain nutrients like fiber and almost no saturated fat. However, pretzels on their own aren’t particularly filling and are often high in sodium. Pair with a low-fat slice of cheese or fruit for a boost of energy and opt for a low-sodium variety.

Not this: potato chips

As satisfying as the crunch of a salty chip might be while getting through a dull PowerPoint slide, it’s really not going to do much for you when it comes to staying awake. Most potato chips are high in sodium and saturated fats and low in nutritional value.

Try this: frozen grapes

If you’re craving a frozen sweet treat but don’t want all the fat and sugar that comes with it, try throwing a bag of green grapes in the freezer. Not only will you fill up on potassium, iron and Vitamins C and D, they are just the refresh you need to survive your all-nighter.

Not this: ice cream

Ice cream may provide you with an instant sugar high, but the aftermath may not be worth it. Its high fat and sugar content doesn’t exactly make it the optimal late-night snack, and even low-fat varieties often contain plenty of chemical additives.

Try this: green tea

Green tea may not contain as much caffeine as an energy drink or a cup of coffee, but research has shown it leads to improved brain function and memory. But if you’ve loaded up on caffeine throughout the day, you might want to be wary of adding even more into your diet.

Not this: energy drink

Have you ever thought about what’s actually in an energy drink? You might be better off not knowing. While manufacturers advertise Vitamin B, there’s a lot more that goes into that fizzy drink — and it’s mostly chemicals and about 15 and a half teaspoons of sugar in a 16-ounce can, according to Eating Well.

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