There are going to be times when you have finished your meal or snack and you are hungry again long before your next meal is scheduled or right before bed. Depending on how much time you have to go before you are supposed to eat again and what your blood sugar levels are at you may want to move your meal time up or indulge in some free food.
If this happens frequently it is time look at your eating schedule and meal plan. If you have recently added more physical activity to your daily routine, you will also have to increase your food intake to compensate for the extra energy your are using up. If this isn't the case and you are unsure why your appetite has increased or your current meal plan is no longer working, speak to your dietician to see if there are some revisions that can be made to prevent this from happening.
When you have gestational diabetes, it is recommended that you have a snack before bedtime to tide you over until the morning. It will also be important to have a bedtime snack if you are taking an insulin injection prior to bed so that your blood sugar does not become too low overnight. If neither of these scenarios applies to you, you can have some free food before bed if you are finding that you are hungry at night time. A bouillon (beef or chicken broth) might stave off hunger pangs and allow you to fall asleep.
If you are hungry at night time and your blood sugars are low, do have something to eat to raise your glucose level. If this is a frequent occurrence, you may not be eating enough food at dinner time. Try adding a protein or carbohydrate to see if this makes a difference.