I have posted before about my DD (8 weeks) struggling to sleep well in the day time due to overstimulation. I am trying to put her down for naps upstairs (I know technically against SIDS advice) and wondered if I should keep the room light or if I should shut the curtains. I find she sleeps better in a darker room but will she start to mix up day & night? She is currently pretty good at night so I don't want to mess it up!