Is it normal that i'm in my late 20's and becoming afraid of the dark?

In the last few weeks I've had trouble getting to sleep as when I'm lying in the darkness I don't feel like I'm alone, it feels like there's a presence in the room. I think it's just my mind playing tricks on me, as I have not seen ghosts or anything supernatural like that. I am a creative person with a strong imagination so I think I've started to spook myself out. When I finally get to sleep I have horrible nightmares. I wonder what has caused this darkness to creep into my imagination and make bedtime so creepy. I was never afraid of the dark as a kid. I know the solutions are simple but with the rising cost of electricity I don't want to sleep with a light on and sleeping with a candle burning is dangerous! Maybe its time I got a big ass teddy bear or something lol