At 11pm on a weeknight, a corner table at a Dhanmondi café is still occupied – a laptop, a half-finished cold brew, a freelancer finishing a deadline that was supposed to end hours ago. The cup in hand is doing more to the night ahead than most of its drinkers realise.
Bangladesh’s beverage habits have shifted fast. Cafes that began appearing around 2012 in neighbourhoods like Dhanmondi, Banani, and Uttara have since multiplied into what amounts to a parallel co-working infrastructure – reliable Wi-Fi, plug sockets, and quiet corners that keep young professionals and freelancers at their tables well past standard office hours.
Where tea stalls once closed the day’s business over a single cup at dusk, today’s café culture increasingly treats late evening as simply another work shift, fuelled by whatever keeps the drinker upright.
The trouble is physiological, not just habitual. Caffeine works by blocking adenosine, the brain chemical that builds up through the day and signals tiredness – which is precisely why a cup at 9pm can feel like exactly the lift a stalled deadline needs.
But caffeine’s half-life runs roughly five to six hours, meaning half the dose from a 9pm cup is still active in the bloodstream well after midnight. Even when it doesn’t delay the moment of falling asleep outright, residual caffeine is known to shorten deep, slow-wave sleep – the stage most responsible for physical recovery and next-day cognitive sharpness – leaving drinkers technically asleep but poorly rested.
For Dhaka’s always-on professionals – freelancers juggling international clients across time zones, employees answering messages well after office hours, students studying into the night – a late cup often isn’t indulgence but necessity. That necessity, sleep researchers note, tends to compound: Poor sleep drives fatigue the next afternoon, which drives another late-day cup, which disrupts the following night in turn.
What looks like a productivity habit is, more often, a slow-building sleep debt that caffeine can mask but never actually repays.
The fix requires no more willpower than remembering caffeine’s clock rather than the day’s. Sleep specialists generally recommend a cutoff of eight to ten hours before intended bedtime – meaning a professional aiming to sleep by midnight should treat 2pm, not 9pm, as last call.
For a culture built around the late-evening cup, that is a harder habit to break than the caffeine itself. But for Dhaka’s cafes to keep being places where people do their best work, the healthier version of that ritual may need to end considerably earlier than the lights do.
