Sleeping Problems?

Ugh it is horrible. The other night I watched Paranormal Activity with my friend. It was soooo creepy but we stayed up so late that it didn't matter that it was scary. But last night it did. I had been researching the demons in my story most of the night and then when the time came to sleep after I had done some writing, I couldn't. It was far too creepy. So, I read an entire book and then played a little bit of video games(mario tennis!). It was only until about 3:30 a.m that I was able to calm down enough to sleep. Should my mind keep me up at night?