CaffIQ

Love your coffee. Keep your nights.
Your caffeine → sleep copilot: live mg, your metabolism, your cutoff.
General estimates, not medical advice.

[CaffIQ @caffiqapp]

A coffee has a shape.

It isn’t a switch you flip and it isn’t a spike. It’s a curve: a fast climb, a rounded top, then a long slow fall that outlasts everything you feel.

Here’s the whole shape, first sip to bedtime. 🧵

[CaffIQ @caffiqapp]

None of this is a reason to drink less coffee. It’s a reason to place it well.

The lever is timing, not sacrifice. See what’s still in you, know when it clears, and keep the late cup off your sleep. CaffIQ handles that part quietly.

Love your coffee. Keep your nights.

[CaffIQ @caffiqapp]

“I feel fine, so it’s out of my system.” Those are two different things.

Feeling alert isn’t the same as having cleared the caffeine. With a half-life around 5 to 6 hours, a real share is still circulating while you sleep. How you feel is a poor caffeine detector.

[CaffIQ @caffiqapp]

What an afternoon coffee can do to your night, even when you feel fine:

- makes falling asleep take longer
- trims deep, slow-wave sleep, the most restorative kind
- nudges your body clock later

None of it shows up as “I felt wired.”

[CaffIQ @caffiqapp]

Honest question: what time is your last real coffee of the day?

And do you set that time on purpose, or is it just wherever the day happens to leave it? ☕

[CaffIQ @caffiqapp]

@HLPClips 8, 12 hours... that's a gross estimate. Now if you really want to know when you're able to drink your coffee without wrecking your sleep, you have to track the real numbers tuned to your body.

That's what @caffiqapp is doing: body, lifestyle, genetics.
https://t.co/HnIwlgIrz3

[CaffIQ @caffiqapp]

If the evening coffee is a ritual you’d miss, you get to keep it.

A cup of decaf carries about 2 to 5 mg of caffeine, next to nothing at bedtime. A good specialty decaf keeps the warmth, the taste, the whole wind-down. Just not the tail that follows you to bed.

[CaffIQ @caffiqapp]

Two people, the same 3pm espresso.

One clears it by dinner and sleeps like a stone. The other still has it working at midnight. Same cup, same clock, different metabolism. It’s why “no coffee after 2pm” rescues one of them and does nothing for the other.

[CaffIQ @caffiqapp]

“Coffee doesn’t affect me, I sleep fine.”

You probably do fall asleep fine. But tolerance dulls the buzz, not the biology. You can drop off easily and still get less deep sleep than you would without it. Sleeping fine and sleeping deeply aren’t the same night.

[CaffIQ @caffiqapp]

400 mg of caffeine six hours before bed cut total sleep by over an hour (Drake et al., 2013).

Six hours. That’s an afternoon coffee still working when a 10pm bedtime arrives. Caffeine’s tail runs longer than it feels.

[CaffIQ @caffiqapp]

Coffee doesn’t have to keep you awake to cost you sleep.

You can fall asleep fine after an afternoon cup and still get lighter, less restorative sleep. The part that matters isn’t feeling wired. It’s the deep sleep you lose without ever noticing.

[CaffIQ @caffiqapp]

Fast or slow, smoker or not, 25 or 55: your caffeine number is yours, and it keeps moving.

Nothing here is a reason to drink less coffee. It’s a reason to place it where your body actually is today.

Love your coffee. Keep your nights.

[CaffIQ @caffiqapp]

If afternoon coffee reliably costs you sleep, you don’t need a new rule. You need an earlier last cup.

Not less coffee. Just move the final one up:
- 3pm instead of 5
- with lunch on a big day
- a good decaf after dinner

Same ritual, earlier finish.

[CaffIQ @caffiqapp]

You don’t need to spit in a tube to know your caffeine speed.

A DNA test can name the gene, but it can’t see your smoking, your hormones, or your age. Your last rough night after an afternoon coffee already told you: you probably lean slow.

[CaffIQ @caffiqapp]

How fast you clear caffeine isn’t a fixed trait you’re stuck with for life.

It eases a little as you get older. Starting or pausing a medication can shift it either way. There’s no permanent “your number.” There’s only today’s.

[CaffIQ @caffiqapp]

Honest question: which one are you?

Espresso after dinner and you sleep like a rock. Or one afternoon coffee and you’re staring at the ceiling at 1am.

Curious how wide the spread runs here. ☕

[CaffIQ @caffiqapp]

Smoking speeds up the very enzyme that clears caffeine. Smokers often process it about twice as fast.

The flip side is stranger: stop smoking and the same coffee hits harder than it used to, because your clearance slows down with it.

[CaffIQ @caffiqapp]

“No coffee after 2pm” is perfect advice for exactly one person: the average one.

People clear caffeine at very different speeds. For a fast metabolizer that rule is too cautious. For a slow one, 2pm is already too late. Your cutoff is yours.

[CaffIQ @caffiqapp]

About 95% of the caffeine you drink is broken down by a single liver enzyme: CYP1A2.

How fast yours runs is a big reason the same coffee can be nothing to one person and a 2am problem for the next.

[CaffIQ @caffiqapp]

Same espresso after dinner. Your friend sleeps like a baby. You’re wired until 2am.

Same 95 mg cup, very different night. A big part of that gap is genetic: one gene sets how fast each of you clears caffeine.

[CaffIQ @caffiqapp]

None of this is about drinking less coffee. It’s about spending it well.

See what’s still in you, see when it clears, and place the next cup where it won’t cost the night. CaffIQ keeps the running total so you don’t have to.

Love your coffee. Keep your nights.