Night feedings

EMA

So my little chubster drinks 6oz of formula every 3-4 hours during the day. Last bottle is around 630-7pm and bedtime around 8pm. She tends to wake up around 1am and 4am for feedings. My question is should I still feed her the full 6oz or less? I’ve seen some forums saying that night feedings should be minimal. So how much should I give her?