In case you feel sleep is a waste of time, it could actually be surprisingly productive to sleep. Once thing I noticed in grad school is that your sub-conscious is passively working on the problems you encountered even if you are not actively thinking about them. And often I would "dream" up a clever solution to a homework problem during my sleep. J.P. Serre, one of the most brilliant mathematician still living today…
This is also covered in Matthew Walker's Why We Sleep where he cites several controlled studies demonstrating the role of sleep in learning and outlines the neurobiology behind it: https://www.goodreads.com/book/show/34466963-why-we-sleep I used to see sleep as a waste of time. A few years ago I started to recognize its importance in overall well-being and adjusted my schedule and commute accordingly. Reading Walker'…
One of the most interesting takeaways / proofs about the importance of sleep mentioned in the podcast, was that there's a huge increase in car accidents and heart attacks after the clocks shift in the spring (I haven't verified the claim).