I've had 2 during the day and 2 during the night. I definitely noticed there was a different vibe with them but can't quite put my finger on what that actually is.

I found it hard to sleep afterwards so for me, birthing during the day meant that by the time night came around I was getting over that post birth energy and ready for a sleep. After I had C at 11pm I was wide awake until about 7am when I had a bit of a catnap. I had been awake for over 24 hours.