01
Today’s verified habit quote
“Participants in the to-do list condition fell asleep significantly faster than those in the completed-list condition.”
Scullin et al., The Effects of Bedtime Writing on Difficulty Falling Asleep
02
Why this habit matters
A short tomorrow list gives a few pending tasks a concrete place outside your head. The aim is not to plan the whole week or turn bedtime into another productivity session; it is to record what needs attention so you have a reference for tomorrow instead of trying to hold every task in mind at bedtime.
The evidence is narrow. The experiment tested five minutes of writing in healthy adults aged 18 to 30 during one controlled laboratory night. It did not compare other writing durations or a no-writing condition, and the list is not a treatment for chronic insomnia.
03
Start with one small practice
Sit away from bed → write a short tomorrow list → close the page
- Before getting into bed, sit somewhere you can write comfortably. Use paper if it is available, set a five-minute timer, and write the tasks you need to remember for tomorrow or the next few days. Keep writing for the full five minutes if more tasks come to mind; there is no target number.
- Put each distinct task on its own line in wording you will recognize tomorrow. Record it without planning or solving it now; the study counted listed items and did not require each one to be rewritten as a next action.
- When the five minutes end, place the list where you can find it tomorrow and continue your usual wind-down. In 66 Days, record only whether you wrote the list; closing the page and recording are not timed.
The study task used five minutes, but it did not compare five minutes with another duration or with writing nothing. Five minutes is therefore evidence-aligned, not an established optimum or a guarantee of faster sleep. If writing makes you more alert or worried, stop and return to a calmer routine that works for you.
04
What the science can—and cannot—say
One laboratory experiment compared future tasks with completed activities
Researchers recruited 60 healthy adults aged 18 to 30 and included 57 in the final analysis. Before lights out, participants were randomly assigned to spend 5 minutes writing either tasks they needed to remember over the next few days or activities they had completed over the previous few days.
A technician who did not know each participant's condition scored sleep from overnight laboratory monitoring. This was a direct comparison between two kinds of writing, not a comparison with doing nothing, following a usual bedtime routine, or receiving insomnia treatment.
The future-task group fell asleep faster, but the study leaves important questions open
Participants who wrote future tasks fell asleep significantly faster than those who wrote completed activities. Within the future-task group, people who listed more separate task items also tended to fall asleep sooner; the study counted items rather than rating how specific each sentence was.
The study did not establish whether future-task writing helped, completed-activity writing delayed sleep, or both. It also did not compare another writing duration, test repeated use at home, or include people who reported insomnia or another sleep disorder or participants from other age groups. The idea that writing reduces mental rehearsal is plausible, but the experiment did not measure that mechanism directly.
A small writing practice is not a substitute for insomnia care
For adults with chronic insomnia, the American Academy of Sleep Medicine strongly recommends multicomponent cognitive behavioral therapy for insomnia. The same guideline conditionally recommends against using sleep hygiene alone as a treatment.
The guideline did not evaluate bedtime to-do lists. Treat this list as a low-cost experiment for occasional task-related thoughts, not as a promise of faster sleep or a reason to delay assessment for persistent sleep problems.
05
Reflect and connect it to your tracker
Which unfinished tasks keep returning at bedtime, and could you place them on paper without trying to solve them tonight?
Create a “five-minute tomorrow list” action in 66 Days and record completion, not how quickly you fell asleep.
Track this cue in 66 DaysResearch and primary sources
- The Effects of Bedtime Writing on Difficulty Falling Asleep: A Polysomnographic Study Comparing To-Do Lists and Completed Activity ListsJournal of Experimental Psychology: General, 2018 · DOI 10.1037/xge0000374Researchers randomly assigned healthy adults aged 18 to 30 to write for 5 minutes about future tasks or recently completed activities before overnight laboratory sleep monitoring; 57 participants were included in the final analysis.The to-do-list group fell asleep significantly faster than the completed-list group. Within the future-task group, a larger number of listed items—not a rating of wording specificity—was associated with taking less time to fall asleep. The study had no group assigned to write nothing, covered one night in a controlled laboratory, excluded people who reported insomnia or another sleep disorder and certain other health conditions, compared no other writing duration, and did not directly measure the proposed mental-offloading mechanism.
- Behavioral and Psychological Treatments for Chronic Insomnia Disorder in Adults: An American Academy of Sleep Medicine Clinical Practice GuidelineJournal of Clinical Sleep Medicine, 2021 · DOI 10.5664/jcsm.8986An American Academy of Sleep Medicine task force developed recommendations for adults with chronic insomnia using a systematic review and a formal assessment of evidence certainty.The guideline strongly recommends multicomponent cognitive behavioral therapy for insomnia and conditionally recommends against sleep hygiene as a stand-alone treatment. It did not evaluate a bedtime to-do list as a treatment, so the laboratory writing study should not be presented as clinical insomnia care.