10 Apps That Will Turn Your Apple Watch Into a Sleep Tracker

Cost: free to download; memberships start at $25 after a seven-day free trial

If you have an irregular work schedule or always feel like you need to catch up on sleep, you'll definitely want to download Rise. Based on your tracked sleep patterns, the app builds you a personalized "energy schedule" so you can figure out when you'll be most or least productive during the day. It also calculates your hours of sleep debt so you know exactly how much sleep you'll need to feel rested.