This comes from a noob but I hope it helps. I actually don't find evenings difficult at all. for me the difficult time is night shift as its all wrong but days I find relatively easy. I think its because when I am not work or karate/kickboxing of an evening i am variously bouncing up and down on the sofa with the nintendo wii/designing a new tattoo/doing paperwork/playing with the kitten/surfing the net/out at the cinema/visiting people/DIY'ing...you get the picture.
I guess what I am saying in a long belaboured way is what other people have stated - distraction is a wonderful thing - im usually a bundle of nervous energy, i dont tend to sit still for long so i dont have time to get bored and contemplate food. Any kind of hobby or distraction is great. Have a nice walk with the family, play a game or try a new hobby. Best of british.