Patients < 18 years of age treated in an intensive care unit for 5 days or more with infusion of opioids and/or benzodiazepines, are eligible for inclusion. Patients are included at the time tapering of these drugs is initiated. Part one of the study is observational. Drugs administered, complications, Comfort score and WAT-1 (Withdrawal Assessment Tool-1) score is recorded. Before part two of the study, an algorithm for tapering of analgosedation is implemented, and the data set is obtained as in part one.