Can I stilldrink this?
Find out if the caffeine in your drink will still keep you up at bedtime before you take the first sip.
Calculated from caffeine content, its half-life and your wake-up time.
How it works
Three steps between you and a good night's sleep.
Watch it leave your system
Latte (example) · 126 mg — how the caffeine fades over the next 14 hours.
Drops under the 50 mg sleep line about 7.3 h after you drink it.
How drinks compare
Caffeine per typical serving. One espresso ≈ 63 mg.
- Bang Energy300 mg
- Cold brew200 mg
- Large brewed coffee190 mg
- Monster Energy160 mg
- Latte126 mg
- Club-Mate100 mg
- Red Bull80 mg
- Matcha70 mg
- Espresso63 mg
- Black tea48 mg
- Coca-Cola32 mg
- Green tea29 mg
- Decaf coffee3 mg
Why it matters
One protected night of sleep compounds across your mind and body. Here's what the research shows.
- 40%better learning capacity
- 20%faster skill acquisition
- 9%sharper reaction accuracy
- 24%fewer appetite spikes
- 28%steadier hunger hormones
- 50%stronger immune response
Questions & method
How the numbers work, and where they come from.
How long does caffeine stay in your system?
Caffeine has a half-life of about 5–6 hours in healthy adults, so half is gone after roughly 5.5 h and a quarter is still circulating about 11 h later. The range is wide (≈1.5–9.5 h) depending on genetics, pregnancy, medication and smoking.
What is a half-life?
The time your body takes to clear half of the caffeine. After one half-life a 150 mg coffee is down to ~75 mg, after two it's ~38 mg, and so on. We use 5.5 hours.
Why 8.5 hours before your wake-up?
We set bedtime 8.5 h before the wake-up time you give us — room for the 7–9 hours of sleep recommended for adults, plus time to actually fall asleep. Change your wake-up time and the maths updates.
Is the 50 mg threshold right for me?
It's a conservative line, not a hard rule. Below ~50 mg most people sleep fine; 50–100 mg can delay sleep if you're sensitive; above 100 mg is likely to disrupt it. Caffeine sensitivity varies a lot, so treat it as guidance.
Where does the caffeine data come from?
Typical serving averages we maintain, plus Open Food Facts for scanned barcodes. Actual content varies by brand, size, roast and recipe, so every number is an estimate.
Is this medical advice?
No. Last Sip is an educational estimate of caffeine clearance, not medical advice. If caffeine or sleep is seriously affecting you, talk to a doctor.
Method & sources
Single-compartment exponential decay with a 5.5-hour half-life. Thresholds are informed by Drake et al. (2013), Journal of Clinical Sleep Medicine, which found 400 mg taken even 6 hours before bed measurably disrupts sleep. Half-life range comes from caffeine pharmacology reviews; adult sleep-duration guidance (7–9 h) comes from the National Sleep Foundation. Individual sensitivity varies, so results are estimates.