Time lapses that transition from day to night (or vice versa) are considered the Holy Grail of time lapses. Aside from the actual tactics of taking a time lapse you add in the added complexity of changing light. I’ll admit that it can be quite intimidating to even try.
This video from Mark Thorpe make it look all to easy though. It is 15 minutes long, but it is packed with some tips that I’ve never seen before, so its definitely worth the time. Aside a Genie mini which mark uses for motion, he uses quite an interesting camera+lens combo. If you are strongly hooked on either Nikon OR Canon, you may wanna look away, as Mark shoots a 5Dmk3 with a 14-24 Nikon lens.