Because they are repetitive, the body and mind gets used to doing activities and the activities become easier to do over time
Knowing what will happen next helps you feel prepared. For example, if you know morning walk is next, you know to get your shoes on to go outside.
By knowing what will happen throughout the day, it helps you know how to act or behave. For example, when you know it is quiet time, you know to be calm and to sit or lay down during this time