This is called polyphasic sleep. Wikipedia can give you a much better understanding than I can: https://en.m.wikipedia.org/wiki/Polyphasic_sleep https://en.m.wi

This is called polyphasic sleep. Wikipedia can give you a much better understanding than I can: https://en.m.wikipedia.org/wiki/Polyphasic_sleep https://en.m.wikipedia.org/wiki/Polyphasic_sleep From personal experience when I tried this briefly in high school, I wasn't getting very deep sleep and just kept ending up tired. Perhaps if I had continued I would have adjusted, but I gave up after just one week.