I haven't really thought that this was a problem till recently. I'm addicted to daydreaming, reading, tv, and video games. When I get into a book or television show it's all I can think about. I stayed up till 4am last night reading despite having to wake up at 6 to go to work and despite my eyes burning in pain.
I started watching a tv series a few months ago and I spent all my free time watching it. I would stay up till I finished the entire season then I would get anxious and have to go out and buy the next season. I try to hide some of the strange things I do. When my boyfriend wakes up in the middle of the night and he sees I'm still up he looks at me like I'm crazy. I've even started to pretend I am sleeping when I hear him move then I sneak back to what I was doing.
When I finish something I get angry and anxious and I start to panic so I revert to daydreaming as backup until I find the next best thing.
I get extremely angry when people interrupt me while I'm doing any of these things. I know why I'm doing this but I can't help it.
I even start acting like the characters in whatever I'm into...and those are the only times I am in a good mood but they don't last long.
I started watching a tv series a few months ago and I spent all my free time watching it. I would stay up till I finished the entire season then I would get anxious and have to go out and buy the next season. I try to hide some of the strange things I do. When my boyfriend wakes up in the middle of the night and he sees I'm still up he looks at me like I'm crazy. I've even started to pretend I am sleeping when I hear him move then I sneak back to what I was doing.
When I finish something I get angry and anxious and I start to panic so I revert to daydreaming as backup until I find the next best thing.
I get extremely angry when people interrupt me while I'm doing any of these things. I know why I'm doing this but I can't help it.
I even start acting like the characters in whatever I'm into...and those are the only times I am in a good mood but they don't last long.

But of course you should know that its not always the healthiest thing to stay up so late, never to go outside, etc. It's great to be passionate about somethings, and mild obsessions can be fun but when your obsession reaches the point of rudeness or avoidance of others, and impairs your daily functioning. Doesn't sound like you're at that point, but make sure you're conscious of what you're doing.
I probably shouldn't introduce you to tumblr... But its a wonderful place and I think you might like it. If you didn't know, its a place where fandoms flourish, and inter-connecting communities share the same excitement and craziness over fanfiction (fandom-based daydreams, essentially), art and comedic spins on various aspects of a book/show/film. It's a very happy and fun place most of the time, but it can be quite addictive...
As for acting the character, however, (yeah of course it happens) but when I reach that stage, honestly I get a bit worried :D Because I don't like this to happen, I start to feel so immature..so I try to resist it as much as I can :)