When the Light Changes: Coping with DayLight Saving Time

November 4, 2025

Why Does the time change rattles us?

Daylight Saving Time (DST) was popularized in the 20th century to better align waking hours with daylight (standardized in the U.S. by the Uniform Time Act of 1966, later adjusted in 2007). Whatever the intent, even a 1-hour clock shift can feel like social jet lag—your body’s internal clock (circadian rhythm) and the wall clock disagree for days (sometimes weeks). Research links clock changes to short-term sleep loss, mood dips, and safety risks (workplace errors, car accidents).

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ACT Tip:

When “sleep effort” thoughts show up like “I can only get 4 hours of sleep…3…2...0.”

1. Notice and name them (“I’m having the thought that…”)

2. Try your values-consistent action again

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🧭 An ACT-based evening routine

Acceptance and Commitment Therapy (ACT) invites you to choose small, values-consistent actions—especially when motivation is low:

• 🧘‍♀️ Presence: 3 minutes of mindful breathing or a body scan.

• 📖 Learning/Curiosity: 10 pages of a paper book (no tablets or phones).

• 🧴 Care: Unhurried wash + face cream; slow stretches for hips/neck.

• ✍️ Meaning: 1–3 lines of journaling

• 🤍 Connection: Send one “thinking of you” text—then dock the phone outside the bedroom…at least out of reach.

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Sleep Hygiene Menu

$60-120 min before bed

Blue Light Buffer

Dim overheads; switch screens to warm/low brightness or—better—close them altogether. Evening blue-enriched light suppresses melatonin and delays sleep (Chang et al., 2015).

$60-120 min before bed

More than 6 hours before bed

Caffeine Cutoff

Even late-afternoon caffeine can impair sleep onset and quality (Drake et al., 2013). Try reaching for your water bottle instead!

More than 6 hours before bed

Alcohol isn't sleep

It fragments sleep and reduces REM; if you drink, finish several hours before bedtime (Irish et al., 2015).

Consistent wake time > perfect bedtime

Anchor mornings first, the night will follow.

Morning light, Evening Dim

Bright outdoor light within an hour of waking helps reset the clock; keep lights low at night (Rishi et al., 2020).

Cool, dark, quiet.

Room temperature around 65–67°F (18–19°C), blackout curtains, white noise if helpful.

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🔁 7-day circadian reset

• Days 1–3: Wake at the same time daily; get 10–20 minutes of outdoor light soon after waking. Cut screens 90 minutes before bed.

• Days 4–5: Keep wake time; add 15–20 minutes of earlier dinner; limit evening social media.

• Days 6–7: Maintain wake time; add gentle wind-down ritual you actually enjoy (stretch, shower, page of poetry, prayer).

• All week: Caffeine curfew 6–8 hours before bed; brief afternoon walk if you’re sluggish.

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If insomnia persists (more than 3 nights/week for more than 3 months), seek evidence-based care—Cognitive Behavioral Therapy for Insomnia (CBT-I) is the gold-standard, first-line treatment with the strongest efficacy.

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🧷 Untrendy but True

You don’t have to control sleep to improve it.
Pick one small, values-aligned cue tonight. Repeat tomorrow. Clocks shift; your actions can stay steady.

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📚 Resources for the Curious

Books

• 📘 Walker, M. (2017). Why We Sleep. Scribner.

• 📘 Perlis, M., Ellis, J., & Bastien, C. (2019). Insomnia: Diagnosis and Treatment. CRC.

Podcasts

• 🎧 Huberman Lab — light, caffeine, and sleep tools

• 🎧 Sleep Is A Skill — practical routines and tracking basics.

Tool:

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🧠 References

• Chang, A.-M., Aeschbach, D., Duffy, J. F., & Czeisler, C. A. (2015). Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness. Proceedings of the National Academy of Sciences, 112(4), 1232–1237.

• Drake, C., Roehrs, T., Shambroom, J., & Roth, T. (2013). Caffeine effects on sleep taken 0, 3, or 6 hours before bedtime. Journal of Clinical Sleep Medicine, 9(11), 1195–1200.

• Edinger, J. D., Arnedt, J. T., Bertisch, S. M., Carney, C. E., Harrington, J. J., Lichstein, K. L., Sateia, M. J., Troxel, W. M., Zhou, E. S., Kazmi, U., & Heald, J. L. (2021). Behavioral and psychological treatments for chronic insomnia disorder in adults: An American Academy of Sleep Medicine clinical practice guideline. Journal of Clinical Sleep Medicine, 17(2), 255–262.

• Hayes, S. C., Strosahl, K. D., & Wilson, K. G. (1999). Acceptance and Commitment Therapy: An Experiential Approach to Behavior Change. Guilford Press.

• Irish, L. A., Kline, C. E., Gunn, H. E., Buysse, D. J., & Hall, M. H. (2015). The role of sleep hygiene in promoting public health: A review of empirically supported recommendations. Sleep Medicine Reviews, 22, 23–36.

• Qaseem, A., Kansagara, D., Forciea, M. A., Cooke, M., & Denberg, T. D. (2016). Management of chronic insomnia disorder in adults: A clinical practice guideline from the American College of Physicians. Annals of Internal Medicine, 165(2), 125–133.

• Rishi, M. A., Ahmed, O., Barrionuevo, P., et al. (2020). Daylight saving time: An American Academy of Sleep Medicine position statement. Journal of Clinical Sleep Medicine, 16(10), 1781–1784.

• Roenneberg, T., Winnebeck, E. C., & Klerman, E. B. (2019). Daylight saving time and artificial time zones—A battle between biological and social times. Current Biology, 29(18), R941–R943.