Nightmares about shots?

My 17 month old has been battling a very stubborn ear infection for the past few weeks. This past Monday her pediatrician decided it was time for some antibiotics in the form of 3 shots, one to be given every 24 hours for 3 days. It was a traumatic experience for her each day when it was time for the shot (as it is for every child every time they get shots). Although she has stopped pulling on her ear, Wednesday and Thursday night she slept terribly. She kept waking up every 30-50 minutes, crying and babbling and was very upset. It was also really hard to calm her down. I'm wondering, do you think she may be having nightmares about the shots? I just can't think of what else it could be, since the antibiotics were supposed to make her feel better. Any thoughts?