PROBLEM : crave junk food at night? HELP?

How can I not crave bad food at night , during the day im soo good i bring little packed food items i made in portions and healthy and soo good about my diet but the thing that screws me up is that at night time i want every type of fat food there is. I have ice cream in my freezer I wouldnt crave it at all but at night im like ice creamm! im throwing it out tommorow i did hold back my ice cream temptation but tonight i cheated and made nachos . I was thinking a good idea would be to buy sleeping pills, and when it comes to night time and i start craving stick a pill in my mouth and fall asleep before i eat anything good idea or what ? ALSO even if i eat healthy foods to make me not hungrey i still want that junk help