I do the same thing occasionally on my days off, I will only get like 1000 calories in but all I will do all day is watch Netflix on my couch. The next day I will crave protein and sugar like crazy though, which is probably why you over eat as well. Your body is trying to make up for the day before. I would suggest adding in some higher calorie fruits on the days that you feel like you aren't that hungry, things like bananas and avocados work great for that, full of the good for you sugars and fats.
if the problem is that you already feel full - maybe go for something healthy that is low volume but high cal? like a handfull of nuts, a tbs of peanut butter, some dried fruit, etc.
I mean, we all have our "off" days, when we either eat more or less than we intend to... but if it happens often or messes with your eating the following day - it would probably be a good idea to try and make adjustments
It happens to me often - I'm so used to 1200 cal I'm having trouble getting myself to eat 1600-1700 cal a day (for maintenance)... especially since it's summer and heat makes me lose my appetite... I've gotten into the habit of having a glass of full fat milk in the afternoon & adding a handfull of nuts and/or seeds to my morning snack... it's a quick and not too filling way to add 300+cal to my intake
You may not like them -- but there are hints within this thread from a while back.
This is definitely the best way to answer your question.