lucid interval

Translations
светлый промежуток
During the patient's lucid interval, they were able to communicate clearly.
Во время светлого промежутка у пациента он мог ясно общаться.
Definitions
A lucid interval refers to a period of time during which a person with a mental disorder, such as a psychiatric illness or brain injury, experiences a temporary return to a clear and rational state of mind, allowing them to think and communicate normally before reverting to their previous impaired condition.
Words
lucid

adjective
ясный
interval

noun
интервал