The term "nighttime routine" refers to a series of activities or tasks that are performed regularly before going to bed. These routines can include personal hygiene practices such as brushing teeth, washing face and hands, taking a shower or bath, changing into comfortable sleepwear, and other relaxation techniques like meditation, reading, listening to calming music, or having a warm drink. The purpose of establishing a consistent nighttime routine is to help the body prepare for rest by creating a sense of calmness and reducing stress levels before bed.