> Can you really say that unless you switched fields multiple times?
I have ;-) far too many times! Even going back and taking undergrad math coursework that my engineering curriculum didn't have like Discrete Math or Statistics got a lot harder than calculus / differential equations was when I was younger. I felt like I got less out of each hour, and also couldn't put in as many hours - not just because I have more responsibilities, but also because my brain just gets tired after fewer hours.
Have you tried creatine supplements? Especially if you're vegan or don't eat a lot of meat. Most people take it for muscle performance, but I found it insanely helpful for maintaining a sharp mind throughout a long day, especially with little sleep. That's also what the latest research starts to appreciate. I wouldn't be surprised to see recommended doses above 10g/day in elderly soon-ish since there are basically zero downsides even at much higher doses. In my early 30s I thought I lost my ability to pull all nighters because of increased tiredness, but now I feel like I can do even more than when I was 18. Most people greatly underestimate diet in general because they used to get away with anything when they were young.
Counterpoint: I've been taking creatine (10-15mg/day) for over 8 months and I can't say that I notice a difference at all.
That said, while I think that creatine's effects on cognitive performance are often overstated, creatine is scientifically proven to increase brain performance in some cases[1].
And fortunately, creatine is safe and very cheap[2], so maybe worth a try.
Did you have problems with tiredness and concentrating? Especially after only getting very little sleep for an extended time? Or did you already consume a lot of meat? There are many factors here that could potentially make it not worth your while. As with all supplements, a good diet and lots of rest can make them little more than expensive pee. But not everyone can have a perfect diet and lots of sleep all the time. Creatine is a supplement for a very particular lifestyle.
>> Especially after only getting very little sleep for an extended time?
>No
Then I'm not really surprised. I also see no real cognitive effects when everything is well anyways. But this one study is what I found to be the most accurate finding overall beyond enhancing muscle power:
I have ;-) far too many times! Even going back and taking undergrad math coursework that my engineering curriculum didn't have like Discrete Math or Statistics got a lot harder than calculus / differential equations was when I was younger. I felt like I got less out of each hour, and also couldn't put in as many hours - not just because I have more responsibilities, but also because my brain just gets tired after fewer hours.