N=1 here, but I’m sure this applies to many others.
I’ve had the habit of waking up between 12am-2am and eating a snack, which could range anywhere from 100-400ish calories. Although I include those calories for the day and exercise; I typically find that when weigh myself in the morning, the weight loss is either negligible or I have a small gain.
Yet, when I don’t eat a late night snack (for example I ate at 6pm yesterday and fast until the next day) my weight loss is usually 1-2lbs at minimum when weighing the next morning.
Scientifically speaking, this could be due to midnight snacking spiking insulin, water retention, in addition to metabolism slowing down during sleeping which could be resulting in fat storage.
I’m almost certain that if you’re a midnight snacker and you’ve been at a stall or slow loss, this could be the key to moving that scale 
