a sickness time is a mean of rest that buy sickness
people_who is tired_should_rest. naughtiness is disobedience. time_redundancy is redundancy. altitude_sickness is disease. morning_sickness is nausea. weekends is time_for_rest. nap is time_of_rest. pernicious_anemia is anemia. redundancy is repetition. rest_day is day_of_week.