I am trying to get sleep samples for last 7 days and store them and add whenever I want. I am using HKSampleQuery to fetch all the samples and storing samples which are only inBed samples but sometimes I am getting multiple samples with overlapped time intervals. How to get proper sleep data without any overlaps? I am using below code to get the data func readSleep(from startDate: Date?, to endDate: Date?,Id:Int, Completion: @escaping (Double,Date,Date,Int,String)->Void) { var sleepingHoursCount = 0.0 let healthStore = HKHealthStore() guard let sleepType = HKObjectType.categoryType(forIdentifier: .sleepAnalysis) else { return } let predicate = HKQuery.predicateForSamples(withStart: startDate, end: endDate, options: .strictEndDate) let sortDescriptor = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false) let query = HKSampleQuery(sampleType: sleepType, predicate: predicate, limit: HKObjectQueryNoLimit, sortDescriptors: [sortDescriptor]) { (query, result, error) in if error != nil { return } guard let result = result else{ Completion(sleepingHoursCount,startDate!,endDate!,Id,"") return } // do{ if let sleepSamples = result as? [HKCategorySample] { for sample in sleepSamples { guard let sleepValue = HKCategoryValueSleepAnalysis(rawValue: sample.value) else { return } let isInBed = sleepValue == .inBed if(isInBed){ let diffSeconds = sample.endDate.timeIntervalSinceReferenceDate - sample.startDate.timeIntervalSinceReferenceDate sleepingHoursCount += diffSeconds Completion(diffSeconds/3600,sample.startDate,sample.endDate,Id,source) } } } } healthStore.execute(query)