Normally people think a dream is bad because it involve monsters hunting them down and killing their family and such, but nothing's wrong with dreams like that.
A bad dream is when you dream about perfectly normal daily routine during which you discover that you misrememebered and World AIDS Day is actually January 1, not December 1 as you'd believed. Such dreams fill you with misinformation that you have little or no reason to doubt.
Luckily this dream was easily confirmed a dream. World AIDS Day is December 1. Take that, subconscious!
(Why is 'subconscious' a noun? What idiot did that?)