I've been told that from all the moving you do during the day, relaxes them & puts them to sleep. Then at night they're active the most, cause you're probably doing less movement which wakes them up. Hope that helps (:
I read that babies tend to kick more at night because you are lying still and during the day you are moving around and the like the movement.
I've asked this question before and got a few diff answers. It really just depends. Mine used to only move during the nighttime and never during the day but she has recently switched schedules cause now I only feel her during the day and barely at night time...