scared to death

i put Rigby to bed, but like every other night she finds about a dozen ways to get out of her room and come ask me random questions. As i snuggle Adler trying to get her to go to sleep i just send Rigby back to her room and tell her i will be in a minute. finally Adler is asleep i take her to her room and lay her down in bed. i gently close the doors and head into Rigby's room. Rigby has decided that she wants me to switch up the pillow cases. as i have not done it in a few weeks so i agree. so as i am starting the switch i hear Adler start fussing before i am done switching out the 1st case she is bawling. i try to go super fast and put the second pillow case on and get out by the time i am done she is keening like nothing i have heard before. you could hear the absolute fear in her screams. it is dark in her room/office but the curtains were parted so that some of the moon light and Christmas lights were shining in. so it was dark but not pitch black. i am sure she was 1.)upset mommy was no longer holding her, 2.)she was scared of the dark, and 3.)pissed off she could not figure out (in the dark) how to open the pocket doors. i fling the doors open and she is right there in the door way a wet(tears,) blubbering, snotty mess. i felt horrible. as Rigby has a set of Christmas lights in her room i stole the night light out of her room and set it up in Adler's' room and let her see how it shown and the room would not be dark anymore. it was probably another 20 minutes or more of me holding her in my arms to get her to fully calm down and get back to sleep.