User blog comment:Staraptor Kwan/Question Of The Week: What's the real reason behind Yume's post-performance collapse and her subsequent amnesia?/@comment-25952682-20160419125709

I would actually blame it on an adrenaline rush. Similar to what Ichigo had when she had her debut just a lot stronger for Yume thus the harsh after reaction. (Speaking a bit from experience here. ^^")