One late night = screaming baby

After only one late night last night it looks like we're back to major screaming on the cry it out front. We let Marley stay up until 10:30 last night since we were all at the party. She eventually fell asleep in her stroller to loud music and flashing lights. Today she woke up very late, 11:30am which makes sense since she went to bed so late. But tonight, I'm trying to go back to her original 8pm bed time and there is major high pitched screaming going on. Hopefully it will die out soon, its only been about 15 minutes. But now I understand why parents usually leave the party early...