I've had night and day births - 4.30am and 2.30pm for DS1 and DS2 respectively.

For my day-time labouring experience I had the blinds pulled, so the room was relatively dark - fabulous for my focus and concentration.

I actually preferred my day-time birth as I woke at 7.30am after a decent night's sleep and began having mild contractions, bub born several hours later. With my night-time birth with DS1, I was awake for over 36 hours (woke 8am-ish in the morning, labour began approx 8pm that night and after bub was born early the next morning I was on a high virtually all day, so no sleep till that night - and even then it was a scratchy kind of sleep!).