How Much Downtime Do You Need?

I have a ton of energy. I'm hyperactive. My husband oftentimes he needs more rest than I do. We're completely different energy levels. How much downtime do you need? Is 10 p.m. on a Tuesday really the time to finish? One of the things that I'm beginning to embrace about being human is that I am human. You can't program me to output the same amount every day.