Dr. Michael Grandner

And so I stopped.

And so getting that feedback can sometimes be helpful.

Yeah, I mean, caffeine, probably the most used psychoactive substance in the world.

There's a reason why people use it.

It works, it's relatively safe.

Coffee is actually a great source of antioxidants and phenols, especially if you're actually just, if you're drinking it from coffee, not just the isolated caffeine molecule.

It picks up, peaks at around 30-ish minutes, then trails off.

For most people, four to six hours before bed is the last time they should be caffeinating in any way.

Some people, they can drink an espresso, go to bed just fine.

People metabolize it differently.

For some people, 10 to 12 hours is actually...

too much where they need to stop in the morning or else there's just just enough floating around their system in the evening where they're not like jittery from caffeine they just might have a harder time settling in so that's a real thing people can actually because doesn't caffeine shift your circadian rhythm over as well it's not a circadian signal as much as it can be like an alerting signal and which can change your activity rhythm which it's which is more of the circadian signal

I don't think, I don't know, I haven't seen anything, I could be wrong, but I haven't seen anything with caffeine itself as a potent circadian marker, except that if you drink caffeine around the same time every day, you can make it one.

And it increases activity, which is itself a circadian marker.

Well, it might have.

Like it might have shifted.

Well, yeah.

My guess is it would have shifted, it would have delayed, they would have probably increased their activity level, increased their light exposure.

So that's why I like, it delayed sleep onset, but I don't know what it did to endogenous circadian timing.

But I'll have to take a look.