Observed arrival · 2026-11-14
Caffeine at Bedtime Calculator
A free calculator estimates how much caffeine from listed drinks may remain at a planned sleep time, including daytime sleep after a night shift.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Caffeine users planning sleep after a shift
- Worth noticing
- It supports planned daytime sleep after night shifts and lets users compare 4-, 5-, and 6-hour half-life assumptions.
Field notes
Users can set a planned date and time, add multiple drinks with their caffeine amounts and consumption times, and adjust the assumed half-life from 2 to 12 hours. The page can compare 4-, 5-, and 6-hour assumptions and show a timeline as either a chart or keyboard-navigable table. A “skip one drink” comparison preserves the entry rather than altering it; the site labels the result an educational scenario, not a prediction or medical recommendation.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
One card from the complete issue