Itchy breasts

I'm 8 weeks postpartum and I have just started experiencing itchiness on both breasts but only at night. When I wake up to feed my daughter my breasts start to itch. If I scratch them it makes it much worse and I end up getting little red bumps. I called the lactation consultant about it and she said it could be heat rash bc it was gone by the morning. Has anyone experienced anything like this or have any clue as to what it could be? I'm thinking something hormone related and due to longer lengths in between feedings?