Riotous (adjective) – of the nature of a riot

https://www.merriam-webster.com/dictionary/riotous

“That night riotous and colorful dreams invaded Helga Crane’s prim hotel bed. She woke up in the morning weary and a bit shocked at the uncontrolled fancies which had visited her.” (pg 133)

Understanding what ‘riotous’ means describes the dream that Helga Crane had which was a dream that was vivid and out of her controlled which is what led her to wake up shocked because they seemed real and it was something that she should’ve controlled but couldn’t.