I do great all day and struggle at night too. For me, it's not a nutritional thing, it's a habit thing. Nighttime was my "eating time".
I make sure I'm eating enough during the day to know that my evening hunger is not "real hunger". I plan a snack for the evening too. If I'm *STILL* struggling, I make a cup of decaf coffee and sip it. Coffee dulls my appetite and I think of it as a kind of dessert. It "signals" that I am done eating.
Someone on here told me to turn off the kitchen light and declare it "closed" for the evening. That really seems to help, too.
It's getting easier the longer I do this. Hang in there!