I and some others don't place a whole lot of thought on the sticks. I'd be more concerned with the late night eating, no matter what it is.
As for the coffee, it's a big question, as, some do fine with regular, others it stops the loss, ( providing the diet is otherwise being followed properly), it's an easy one to blame.

Try downing some water, if your feeling you need something that late. Hopefully it'll wash it away

Mostly if you got up to get something..............STAY in BED, have a glass of water by your bed.

Good Luck, Kathy