The 80/20 rule of sleep is a concept that emphasizes the importance of quality sleep over quantity. According to the rule, 80% of the healing and restorative benefits of sleep come from the first 20% of sleep. This means that if you are able to get a good quality sleep within the first 20% of your sleep cycle, you will receive the most benefit from it.
The 80/20 rule of sleep is based on the idea that there are two phases of sleep: REM (rapid eye movement) and non-REM (non-rapid eye movement). During REM sleep, the body is in a very deep and restorative state, and during non-REM sleep, the body is in a lighter state of rest. The amount of time spent in each phase will vary, but the general idea is that the most healing and restorative benefits come during the first 20% of sleep, when the body is in a deeper state of rest.
It is important to note, however, that this rule is not a hard and fast rule. Everyone's sleep needs are different, and the amount of time needed to obtain quality sleep will vary from person to person. Additionally, this rule is not a substitute for getting the recommended amount of sleep each night. The National Sleep Foundation recommends that adults get seven to nine hours of sleep per night.
Overall, the 80/20 rule of sleep is a concept that emphasizes the importance of quality sleep over quantity. By focusing on getting a good quality sleep during the first 20% of your sleep cycle, you can maximize the healing and restorative benefits of sleep.