i have that same problem! i was reading a murder mystery the other night and DH was working a night shift-i almost NEVER got to sleep and when i finally did, every little creak woke me up! it was a loooong night, lol. i hope you get some rest today!
The same thing happend to my aunt a couple of years ago. She reads a lot of books and she decided to read a murder mystery book right after her son left to college. She stayed freaked out for awhile. She would always get up and check the locks.