If you paid more than the amount due on your student loans, it's possible that you are "paid ahead" on your account. Note that being paid ahead has no effect on how your payments are applied to the principal and interest balance - it simply means you are not required to make a payment; however interest continues to accrue daily.
Payments are always applied first to any outstanding interest and any remaining amount is applied to the principal balance. If you pay more than your minimum monthly payment, any amount received in excess of the outstanding interest is applied to the principal balance. You may also receive a bill for the next month which is less than your normal installment amount. If the amount you paid in excess of the amount due is enough to satisfy the next month's payment, your next month's payment due will be zero.
If you are in paid ahead status with no payment due, you can continue to make payments as you would normally. Interest will continue to accrue on your outstanding balance even though you are paid ahead. If you are paid ahead and on automatic debit, your payments will continue to be drafted each month.
A benefit of being paid ahead is that it can give you a financial cushion. Not having to pay your student loan bill one month might be helpful if you have some additional or unexpected expenses that month.