Do you have to use a bottle in the evening?

Lately I've noticed that during the feeding before bed, I'm not making milk fast enough to satisfy my almost 6 month old. I've been giving him a few ounces of expressed milk to help supplement to keep him full. I hate doing this, because I work all day and I look forward to the bonding time of nursing him, but he's just not satisfied with the amount of milk that I produce at night.