You didn't read the article or, if you did, you didn't understand what you were reading. It said nothing about differences in biology or different reactions to lack of sleep.
The article says racism is the cause of lack of sleep among POC. Not much if any mention of poverty as the cause. Unless they think all poverty is caused by racism, which they seem to reinforce a lot in the article. Poor whites also have lack of sleep.
What this has to do with Daylight Savings i don't know. Everyone got an extra hour. Seems more of just an excuse to talk about lack of sleep among POC. Which isn't true. Lack of sleep is disparate problem only among poor POC specifically i imagine, because poverty is the determinant here, not race or racism.