I like having a time to wake up and feel like I had a good night sleep! But I think there should be an add on about naps. Maybe give us a time if we wanna take a nap during the day. Give us the best and worse times to wake up. Sometimes naps are amazing and others you wake up feeling even worse than before, I am sure it is the same concept.
Nfarrar about sleepyti.me: Bedtime Calculator