Too Late For Coffee
How does Too Late For Coffee work?
A simple estimate based on caffeine timing, drink strength, and sleep habits.
The main idea
Caffeine keeps receipts.
Caffeine doesn’t “turn off” when you decide it’s bedtime. It sticks around for hours, quietly cashing out your sleep later.
Most of us underestimate that timeline, especially when the day gets long, the playlist gets good, and the cup looks harmless.
How caffeine works
Half-life, explained like a friend.
For many adults, caffeine has a half-life of roughly 5–6 hours. That means if you drink caffeine now, a meaningful portion may still be active much later.
It’s not a countdown to zero—it’s more like a slow fade. Some people barely notice it. Others feel like tea is a jump scare.
A simple half-life vibe check
not exact, just intuitive
For many adults, caffeine has a half-life of roughly 5–6 hours—so a noticeable chunk can still be “around” later than you’d expect.
How the estimate is calculated
Three inputs, one cozy cutoff.
The calculator takes your bedtime, a quick guess at your sensitivity, and your drink type. Then it works backwards from your bedtime to find the latest “recommended last sip.”
Think of it as a polite last call—not a rule. If your night is special, we won’t tell.
Sensitivity window
- Low
- 6h before bed
- Normal
- 8h before bed
- High
- 10h before bed
Drink adjustment
- Tea
- +0h
- Espresso
- +0.5h
- Coffee
- +0.5h
- Cold Brew
- +1h
- Energy Drink
- +1h
Sensitivity
Because bodies are gloriously inconsistent.
Genetics, tolerance, stress, and even the day you’ve had can change how caffeine lands.
Some people can drink espresso after dinner and sleep perfectly. Others feel awake after tea. If you’re not sure, Normal is a good starting point.
Drink type differences
Not all cups are created equal.
“Coffee” is a genre. Cold brew and energy drinks often carry more caffeine than you’d expect. Tea is usually lighter—usually.
Tea
Usually lighter. Still counts, especially if you’re sensitive.
Espresso + Coffee
Smaller volume doesn’t always mean smaller impact.
Cold brew + Energy
Often stronger—and the “it’s fine” confidence arrives early.
Typical caffeine levels
Ballpark amounts for a common serving—useful for intuition, not precision.
| Drink | Typical caffeine |
|---|---|
| Tea | ~45mg |
| Espresso | ~64mg |
| Coffee | ~95mg |
| Energy Drink | ~120mg |
| Cold Brew | ~150–300mg |
Actual caffeine levels vary significantly depending on size and preparation.
Disclaimer
A calm note, not a warning label.
This is a lightweight estimate—not medical advice. If your sleep is sensitive, treat this like a gentle guide, then listen to your body (and your pillow).
Ready for a last call?
Pick a bedtime, choose your drink, and we’ll give you a cutoff time that’s easy to follow—and easy to ignore responsibly.
Try the calculator