What causes fever blisters on lips and how should they be treated? Also, what is the difference between fever blisters and shingles?

What are the long-term side effects of substituting Vivarin for sleep? Last semester, I averaged only about three hours of sleep a day, and it doesn't look like this semester will be terribly different.

Thanks in advance.

I just came here this fall. Since then, my nose has been bleeding occasionally without any injury. My friend told me it was because of the dry air of U.S. Is he right? How can I prevent this situation? I also have a problem when I brush my teeth. My gums are always bleeding and not just a little!! What should I do? Thanks.

This week I'm getting my tonsils and adenoids taken out. I've never had surgery before and I don't know what to expect. Can you explain please?!?

I go through phases where, when I sleep, I don't have any dreams (that I remember, at least). I sleep well and I wake up rested. Every few months I go through a week or two when I have nights full of incredibly vivid dreams and I wake up remembering at least five or six of them. Because of all these vivid dreams, I wake up feeling far less rested than I do when I don’t dream at all. Is there a particular reason for this? Does dreaming more at night mean your sleep is less restful?

Is it bad to chew sugar-free gum? I heard the chemicals in them are bad for you to ingest?

When both of you have braces, and you do happen to get stuck together, is there any way to unhook without help from anyone other than you and him?