Dreaming of forgetting something is a warning sign as per dream meaning and interpretation. The dream means you might misplace or forget to take important travel documents. It also means forgetting important passwords. Dreams of forgetting something means you will not keep your promise to someone due to forgetfulness.
Dream of forgetting something and later realize what it was in the dream itself means you will forget about some crucial appointment. It also means forgetting to take medicine or switch off something.
Dreaming of forgetting something and you see other people in the dream means your forgetfulness might cause accidents. It also means you might forget to pick up people.
Dream of forgetting something and you wake up for someone reason happy means your forgetfulness might turn into a blessing.