Paranoia

I'm almost 5 months pp and I'm dealing with some paranoia and just wondering if anyone else is also. It only happens at night and it's something that's been happening since I was pregnant. I was letting my brother stay with me for a month or so and I felt safe then but he just moved out and now I'm alone with my baby. I always feel like someone is going to break in and hurt me and my son. I have things set out in front off my doors so intruders will fall over them, I have my box cutter and other handy weapons set out so I can get to them, and I can't sleep because I'm literally watching my bedroom doorknob just waiting for someone to start turning it. Not sure if this is just part of hormones or what but I feel like a nutcase lol. I also feel like it comes in episodes. A few nights of paranoia and then a night or 2 of relaxing and sleeping