HOWEVER...
BUT... I started dating someone who woke up at 5 in the morning.
So I switched my chronotype around.
raulpacheco.org/2016/08/why-di…
Now, my schedule does not fit everyone. I work with night owls.
I use a bi-phasic 6+1.5 sleep schedule raulpacheco.org/2016/11/on-get…
I nap throughout the day. I nap a lot more on weekends, and try to take at least one full day off work (sometimes this works, sometimes it doesn't, how the cookie crumbles).
My colleagues at CIDE, for some bizarre reason, LOVE early morning meetings, so it's taken years of haggling w/them.
raulpacheco.org/2017/06/taking…
At any rate, 4 am works for me.