Glad to help. I wouldn't worry about any of this, by the way. If you feel better on this schedule and don't notice any cognitive effects (e.g. forgetfulness of things that happened in the last two weeks or so), then do what works for you. There's some evidence that sleep restriction, which is the term in the literature for what you're doing (as opposed to sleep deprivation), can actually lengthen your lifespan. If you're a mouse, anyway.
But you're at about the limit: the number I recall is 5.5 hours of sleep being the minimum, but there's probably some individual variation there of +/- 0.5h or something.
> can actually lengthen your lifespan. If you're a mouse, anyway.
Interesting. But I would add that because I'm already winning since it's "time awake" vs "time alive". If sleeping 15 hours a day let me live 10 more years, what's the point if most of them aren't awake :)
But you're at about the limit: the number I recall is 5.5 hours of sleep being the minimum, but there's probably some individual variation there of +/- 0.5h or something.