Do circadian hormones fluctuations follow sleeping patterns or the time of day?

It is said that testosterone and cortisol are at their highest early in the morning, at 8 am, and lowest at night.

What happens, though, if someone regularly goes to sleep at 8 am and wakes up in the afternoon/evening over a long period? What happens if sleep times are inconsistent, sometimes sleeping overnight and sometimes in the morning? Do hormonal fluctuations follow the sleep pattern or do they follow the time of day?