copyWith method
      
DailySleepModel
copyWith({ 
    
    
- String? id,
- SleepContributors? contributors,
- DateTime? day,
- dynamic score,
- String? timestamp,
Implementation
DailySleepModel copyWith(
    {String? id,
    SleepContributors? contributors,
    DateTime? day,
    dynamic score,
    String? timestamp}) {
  return DailySleepModel(
      id: id ?? this.id,
      contributors: contributors ?? this.contributors,
      day: day ?? this.day,
      score: score ?? this.score,
      timestamp: timestamp ?? this.timestamp);
}