Many people assume if your baby is up all day, he will sleep all night – this is not always the case.
The baby is usually so over tired and over stimulated, that they have difficulty settling at night. A baby with structured and regular sleeps in the day is more content and therefore tends to sleep better at night.
Whatever action you take do stick to it for at least 2-3 weeks. It is no good for a couple of days as this is not long enough to get rid of bad habits.