Sunlight to Settle Baby
Circadian Rythmn is the scientific term for the effect that sunlight has on our sleep / wake cycle. Opening the blinds early in the morning and getting a reasonable amount of light exposure to your baby can help set this internal clock.
When darkness comes your baby is more likely to respond to the hormones flooding their system and fall asleep. It may be useful to make sure of adequate exposure to light to help with a less problematic bedtime.