swelling in brain before falling asleep - Iwas recently in a car accident and had a headache when the car stopped I don t remember hitting my head - Iwent to the er and was told Ihave soft tissue injuries. However since the accident I ve had the headache and now am sleeping a lot. According to my daughter Iam passing out and fallen to sleep. I caught myself one time black out where she said I feel asleep. My head feels like it is swelling up inside right before Ifall asleep.