We were leaking a lot during the night here too. I found that she went through a phase where her thighs got leaner and her diapers weren't fitting as well when she was lying down. I did some trial and error to find some that fit better for nighttime (Fuzzibunz and Rumparooz do better than BG for us), but really what saved us was wearing a wool cover over the diaper (under her pjs). We use mostly upcycled wool covers that i made from felted sweaters, but we have one Kissaluvs Wool Lover too. If we are diligent about putting one on every night over the diaper, we don't get leaks.