Why do I crave orange juice late at night?

I find that I get into habits with things really easily. If I have popcorn late at night watching tv then the next night when watching tv popcorn sounds good, and then next thing you know I can't watch tv at night without wanting popcorn. Maybe you had it one night and it was really good and so now when you're thirsty at night thats what your mind associates.

haha, I was at my desk listening to music and I got the same urge to grab some OJ/tangerine combo juice, i knew others would have it so I searched the internet

and sonofabitch, theres none left

I’ve wondered about this myself!

I think it’s because at night (and also after waking up after a night of going out),
your mouth is really parched. Not only do you want some type of liquid,
you also want that extra kick to wake your mouth back up.
That little bit of citrus seems just perfect.