Day time – night time… Aren’t we supposed to “meditate on [the Torah] by day and by night?
I’ve heard of this minhag – it seems to be Chasidishe – but if you’re not Chassidish and you really worry about it – go ask your Rav. We shouldn’t be picking up every minhag we hear about. That’s a good way to get confused (and to confuse your kids along with you).