Questions: Health & Fitness

I'm trying to lose weight and I go to the gym consistently. I do an hour long workout when I do. But I haven't been seeing any results, instead I've gained 7-8 pounds. so the thing is.. I can't fall asleep before 5 am sometimes... sometimes even 7 am. And I wake up at noon. Im a freelancer and my job is such that it allows me to have such an erratic sleeping pattern. Im never hungry when I wake up and tend to not eat until 3-4 pm. And even when I do its a very small amount. I drink coffee and eat a sandwhich around 6-7 pm and dinner at 10-11 pm. So people have been telling me that my poor lifestyle is the reason for weight gain. Is that true? Because i'll make a serious attempt at changing my sleeping and eating patterns if this actually is the culprit..
Also any other weight loss tips will be appreciated..
Im about 144 pounds... trying to get to 120.

For people who want to lose weight, what are the biggest weight loss scams (products, brands, pills, food, systems, wraps, etc.) out there that you would recommend people NOT use? Can be for men, women, or both, regardless of age. What should people completely stay away from?