Nights are notorious...
...for me as well. I have tried making decaf coffee (or tea would work) which seems to really soothe the stomach w/o needing to stuff myself. Drinking water helps, too. This will sound silly, but some nights I brush my teeth to stop myself from eating! I (probably) am a lot older than you, but I hope these ideas are helpful. When I recently went through a graduate program, I eventually gave in to less overall fitness and more snacking just to survive. Now I have reeled myself in and feel in control again. Sometimes its OK to go easy on yourself when you are under a lot of pressure....
Joanna