Depending on the method used there are 4 or 6 chronotypes, which indicate at what times your cicadian rhythm cycles start and finish
To achieve a better sleepscore it's important to know your individual chronotype, so you go to sleep at the time that best fits your rhythm. This will should help to achieve better cycles of sleep.
For example a morning person should avoid following the sleep times/cycle of a night owl, as it would be harder to fall asleep and your alarm may be set to wake you up in the middle of REM cycle.
Can Garmin sleepscore algorithm help determine my chronotype, and tell me what time is best for me to try and go to sleep?