Orb in Baby's Cot

The latest spooky goings on at my parents' house! I now have two children, both boys, one aged 3 (Elliot) and the other aged 6 months (Brody). On a recent visit, my folks and I were downstairs in the living room watching TV and the boys were upstairs in bed when my dad and I both caught sight of something on the video monitor: an orb! It flew up out of Brody's travel cot then dropped suddenly before shooting off up to the left of camera. I have to admit I was terrified that night and barely slept a wink, bearing in mind that most of my ghostly experiences in the house aren't particularly nice. We've been using the monitor for several months and this is the one and only time we've ever seen anything like this. It wasn't dust or an insect as it was way too big given the distance of the cot from the monitor.