Everyday habits
Coffee and sleep: timing matters too
By Sömnlyftet · created with AI support Updated:
The main answer
Caffeine can increase alertness and affect sleep hours after you have consumed it. Sensitivity varies. Start by noting your last caffeine of the day, including tea, energy drinks and other sources rather than coffee alone.
The last cup may still matter at bedtime
NIOSH describes a typical half-life of about 5–6 hours, with substantial differences between people. A meaningful amount can therefore remain hours later. This is not a precise countdown that predicts when you personally will be able to fall asleep.
Record approximate amount and timing
A small cup and a large mug are not the same. Note what you drink and roughly when, without trying to calculate every milligram. Include tea, cola and energy drinks when they contain caffeine. Product information can help you understand what is in a drink.
Try an earlier time rather than adding evening rules
One simple experiment is to move the last caffeinated drink earlier or choose a caffeine-free option later. Keep other habits reasonably similar when comparing. For night workers, the planned sleep period matters more than whether the clock says morning or evening.
An illustrative example
You often have coffee at 16:00 and plan to sleep around 23:00. For a period, you choose a caffeine-free drink after lunch and note how evenings go. A difference may offer a clue, but a few good nights do not prove a definite connection.
A common question
Is there one last-coffee time that works for everyone?
No. Bedtime, amount and individual sensitivity differ. Avoiding caffeine close to sleep is a starting point, not a universal clock time that guarantees a particular night.
Sources and authorship
The sources describe sleep and habits in general. They have not evaluated Sömnlyftet. The examples are fictional and illustrate an approach, not the results you will achieve.