Daydream about what? I agree that daydreaming is healthy, it's fun to mentally drift off and think about the healthy activities that I'm not always able to pursue because of time restrictions. Hiking, stargazing, cooking, motorcycling, music, paintball, etc. Yep, my mind wanders just about every day thinking about the next time I'll be able to do those things.
But there are times too when I daydream about how good an ice cold beer would taste, or how much I'd like a jug of cheap wine with my pizza, or how sophisticated I thought I was when I drank an expensive bourbon or scotch. Next thing I know I'm thinking that it might be safe for me to take a drink. So I'd say it's probably not good for me to romanticize those things too much.