Yes i agree here, when i see the clock 3am i start with prayers (if im awake).3 am is often a time for dark activity, so it makes sense to call light into the hour
It depends on the day, Example Friday = Green= Rose incense(flowers with good odour). Check the heptameron for conjurations of the days. Each day is governed by an Archangel, tells you incenses of the day (Archangels-angels of the day and colors), very informative.And what process like candles incense and prayers do you use?