Your question resonates strongly with me.  About ten years ago, I decided to try Uberman to solve exactly this problem.  While it didn't solve the problem, it taught me a lot about sleep, and it was worth three weeks of hell for that alone.

In the time since then, I've come to the conclusion that it's probably not that sleep recharges our available mental energy.  Recharging is part of it, but I think a bigger factor is probably the fact that sleep provides memory consolidation, and most importantly, sleep makes us forget things.  We are able to make progress in the morning at least in part because after a good nights rest, things feel new and interesting.  We have insights, see things in a different light, because we're partially relearning things we knew previously, and adding another layer of paint onto the picture.  In the morning, we've probably forgotten why we got bored the previous day.

With this in mind, I've tried things like working on one project in the morning, then switching to a completely orthogonal project in the afternoon, then another completely orthogonal project in the evening.  It's easier to be excited about things when the things you learned in the morning don't interfere with the things you're trying to learn later on.  This worked great for me during the Covid lockdowns, when I learned a lot of biochemistry in the evenings, after spending my mornings doing computer related work.

That said, while switching to completely different projects helps, it's still not great.  There's still an energy loss, an inability to care, an apathy to overcome.  If I didn't have work constraints, I would probably try to switch to a polyphasic schedule again to test or verify some of the above;  based on what I've learned over the years, my next attempt would be a balanced triphasic schedule.  This would put me at 6-6.5 hours awake and 1.5-2 hours asleep, with each six hour 'awake' block being a separate topic/category.

im very interested in things in this domain. its interesting that you correctly note that uberman-sleep isn't a solution, and naps don't quite cut it, so your suggested/implied synthesis/middle-ground of something like "polyphasic but with much more sleep per sleep-time-slice" is very interesting. 

given this post is now 2 years old, how did this work out for you? 


in a similar or perhaps more fundamental framing, the goal is to be able to effectively "reset"; to reattain if possible that morning/new-day magic. to this end, the only thing ive found that even comes close to the natural reset of sleep is a shower/bath. in a pinch, washing/dunking the head/face in water can work, but less well. for this reason I often take two showers a day. usually the pattern is: walk+workout, shower, work, get tired, walk outside for 30ish minutes, shower, work some more. the magic isn't fully restored for that second session, but more than if i just walk without the shower. 

if the 'full magic' of true/natural morning can get me 4 hours of Hard Work, then the shower-reset can maybe give me another 30mins to an hour. more work is performed than just Hard Work, but I think you know what I mean.

some people will say workouts/exercise help, but for me they don't in themselves. ie, in the more natural setting of "part of the normal waking up and/or general health routine", of course exercise is a must. but from this framing of "how to get more of the morning/new-day magic", i've found more exercise is counterproductive. even trying to just shift around *when in the day* the exercise is done is counterproductively draining for me; morning is best. not to mention that delaying the workout is a great way to never actually workout since i don't really want to do it at all; the chance i do it at all is maximized in the morning. 

Adderall.