Nightmare
Defeat Sleepwalkers and awaken the Dream Lotus to obtain a Dream Omen.
Remove all Nightmare Roots to turn your Dream Bubbles into actual rewards.
Custom Sweet Dream
You can interact with a Dream Lotus and enter a Sweet Dream when "Dream Lotus grows in the stage." In the Sweet Dream, you must defeat Sleepwalkers to accumulate progress to awaken the Dream Lotus and get one Dream Omen, which will enhance your Dream Bubbles but will also make your future nightmare more dangerous.
Escape Nightmares
As you enter more Sweet Dreams, you have a chance to enter a Nightmare where you must remove all Nightmare Roots to turn your Dream Bubbles into actual rewards.