I think the point made above is that sleep patterns are not 'natural' but 'flexible'. I also have experience where a long-term need to wake up super-early for something that was very important for me made it easy for me to turn gradually into a morning person.

Err. Not an advert for an alarm clock. I google image searched, and then copied the URL.

Apologies if you think I'm trying to sell you an alarm clock.

No, that's not what I meant, sorry. :)

I was curious why you replied to me specifically, even though my point was so obviously not related to yours (and in some ways directly opposed to it). In some way it felt like I was declaring "X, not Y!" and you replied with "I solved for Y with Z, it's awesome!".