Padmé Amidala's demise was foreseen in a dream by Anakin Skywalker.
Dreams are defined as the images, thoughts, and emotions that occur while an individual is sleeping. Nightmares are dreams that are particularly unsettling. Individuals sensitive to the Force sometimes experience Force visions during their dreams, though the meaning and function of these visions are often unclear.
During his time as a slave, Anakin Skywalker had aspirations of becoming a Jedi, which manifested in his dreams. Approximately a decade later, despite Obi-Wan Kenobi's assertion that dreams are fleeting, Skywalker had intense Force visions while he was in a dream state. Anakin foresaw the impending death of his mother and wife through these visions. Furthermore, the inhibitor chips that were placed in clone troopers to compel their compliance with Order 66 inadvertently caused them to have vague nightmares about a perpetual "mission" related to the order, even before the chips were activated.