This is a difficult situation for any couple. Unfortunately, sleep pattern of babies is irregular and varies from one to another. Since this is natural, trying to regularise it with medicines would be unwarranted. If your wife could extend her maternity leaves or if you could arrange some extra support from within the family, it would be wonderful. Just in case you are not aware, most private companies allow medical/earned leaves to be clubbed with maternity leaves. You can ask your paediatrician for a certificate stating that the baby needs her mother round the clock for some more time.

The sleep pattern varies from baby to baby, and your baby is very much normal. Since it is not a disease, it cannot be improved by medicines. Your inconvenience is genuine, though. If you have any support of grandparents, nothing like it....