CortexLit

CortexLit tool · Sleep · Runs offline · No account

Clock Change Risk Check

Estimate how much a clock change is likely to disrupt you from your chronotype, sleep debt and Monday demands.

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This tool gives general information based on the research summarised in Clock Changes: What Happens to Sleep and What to Do About It. It is not a medical device, does not diagnose, and does not replace advice from your clinician.

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  • risk level with reasons
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  • all citations and cautions


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Free tier: 1 share image per result.






Commercial disclosure: optional paid Plus tier; all evidence, cautions and the main result are free. No affiliate links, no sponsors.







What this is based on


Every output names at least one verified PubMed source. Identifiers were verified on 2026-10-11 in an earlier batch and carried over into this build; they were not re-queried here, and no retraction database was checked. Verification was at abstract level.


Romigi 2025
Romigi A, Franco V, Scoditti E, et al. The effects of daylight saving time and clock time transitions on sleep and sleepiness: a systematic review. Sleep Med Rev. 2025;84:102161. doi:10.1016/j.smrv.2025.102161. PMID: 41110263.
PMID 41110263 · systematic review · weight 1.0 · abstract level
de 2025
de Lange MA, Richmond RC, Birnie K, et al. The effects of daylight saving time clock changes on accelerometer-measured sleep duration in the UK Biobank. J Sleep Res. 2025;34(3):e14335. doi:10.1111/jsr.14335. PMID: 39433070.
PMID 39433070 · observational study · weight 0.5 · abstract level
Rishi 2020
Rishi MA, Ahmed O, Barrantes Perez JH, et al. Daylight saving time: an American Academy of Sleep Medicine position statement. J Clin Sleep Med. 2020;16(10):1781-1784. doi:10.5664/jcsm.8780. PMID: 32844740.
PMID 32844740 · guideline recognized body · weight 0.9 · abstract level


Limits: This is an editorial risk score, not a validated instrument and not a prediction. The underlying findings are group averages from observational studies and a systematic review that noted heterogeneity.







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