Does sleeping and waking up early improve productivity?
At the end of the day, it is down to personal preference. There is no guarantee you'll get work done even if you wake up so early; there is also no guarantee you'll get work done if you sleep late.
Just get enough sleep and be consistent with your sleep schedule :)
FYI I sleep between 0000/0030 to 0700/0730 now.

» CHAPTERS
0:00 Introduction
1:34 Old Sleep Schedule
3:35 Benefits of Waking Up Early
5:07 What is the Optimal Sleep?
5:26 Problem With University Productivity Videos
6:52 How I Forced Myself to Wake Up Earlier
8:26 Disadvantage of Waking Up Early
8:57 How I Increased My Productivity
11:35 Conclusion

References:
Biss, R. K., & Hasher, L. (2012). Happy as a lark: morning-type younger and older adults are higher in positive affect.
Chaput, J. P., Dutil, C., & Sampasa-Kanyinga, H. (2018). Sleeping hours: what is the ideal number and how does age impact this?.
Hansen, M., Janssen, I., Schiff, A., Zee, P. C., & Dubocovich, M. L. (2005). The impact of school daily schedule on adolescent sleep.
Escribano, C., Díaz-Morales, J. F., Delgado, P., & Collado, M. J. (2012). Morningness/eveningness and school performance among Spanish adolescents: Further evidence.

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