If you're wondering what time of day to have sex to conceive, the morning may be your best bet. Or, specifically, after your partner gets a good night's rest, says Melissa M. Goist, M.D., Assistant Professor of Obstetrics and Gynecology at The Ohio State University Medical Center.
When sleeping, their body regenerates the sperm lost during the day. Although the average sperm cell has a pretty short shelf life, even stalwart swimmers can hit their expiration date early if they get too warm from hot tubs or exercises like bike riding, Dr. Goist says.
According to one study in Zurich, the best time to have sex to conceive a baby is before 7:30 a.m. during the months of March, April, and May. That may sound odd, but it turns out that sperm may be at its healthiest during the spring months. Not only that, but sperm appears to have its own internal 24-hour clock that helps it determine the best time to travel to an egg.