You're assigning your success to disciplined sleeping habits which seems very strange.

I would ascribe your success to proper nutrition, proper mnemonics, adequate sleep, and lots of studying.

Getting enough sleep (and not too much) is important but what is the advantage of keeping it within those tight boundaries? The natural human sleep cycle is often running on non-24 hour cycles and the science I've seen indicates that if you CAN work on these cycles it enhances memory, cognition and creativity.

I don't understand why you give so much credit to your rigid sleep schedule, especially because all the science I've seen indicates that what is important is getting adequate sleep and then studying properly, not sleeping at particular times.