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Welcome to Tech News Briefing. It's Friday, May 31st. I'm Zoe Thomas for the Wall Street Journal.

Many of us have heard we shouldn't look at our phones, tablets, or other screens before bed,

because it will hurt our sleep.

Some researchers now say it isn't that simple,

and are questioning how much the dreaded blue light from our devices

actually delays sleep. We'll find out what new research on the topic says.

And then, what does the expansion of generative artificial intelligence mean for the future of the web?

The CEO of Mozilla and the president of the Mozilla Foundation shared their thoughts at the W.S.J's Future of Everything Festival.

We'll have highlights from that conversation.

We're starting with new rules for sleep and screens. In the early 2010s, Michael Gratasar,

a clinical psychologist, was among a group of researchers who proposed that bright light from screens at night could delay the circadian

rhythm, the biological clocks inside our cells that time when we sleep and wake.

He co-authored a review published in the journal

...