Researchers in Australia studied over 600 pregnant women who were scheduled for an induced labor.  Out of these women, the ones who were induced in the morning were 17% less likely to need more medication during the delivery than those who were induced in the evening.  Furthermore, mothers who were induced in the morning had shorter labors and were 53% less likely to need any sort of instrument for medical intervention. 

Induction medications take time to work, doctors said, often bringing on hard labor by evening.  The hormone levels that promote contractions are highest in the evening, thereby making the labor faster and with fewer complications.  So if you are being scheduled for an induced labor, ask your OB/GYN for an early morning appointment, giving you better chances of an easier labor.