Sleep
Shift Work Sleep Disorder
Shift Work Sleep Disorder is a sleep condition associated with working night shifts. It can involve difficulty obtaining good-quality sleep during the day and reduced alertness or performance while working at night.
A concise starting point for understanding Shift Work Sleep Disorder as a sleep condition.
This list shows research findings, not treatments. Nothing here replaces medical care. If you have this condition, talk to a doctor.
What may help
None of these options has good evidence yet. Best evidence first.
1 option:1 no benefit found
FastingpracticeNo benefit found
Studies looked for a benefit and did not find one.
The one study found no benefit.
The studies did not support an effect on fasting blood glucose, fasting insulin, HOMA-IR or 2-hour postprandial glucose; pooled analyses whose designs were not recorded reported non-significant results.
Open the Fasting page
The expert view shows every study, dose protocol and source.
What may help
Interventions recorded as helping with this condition1 listedThe best we have, but the evidence is still weak
- →PracticesFastingCertaintyVery lowSourceRCT
The studies did not support an effect on fasting blood glucose, fasting insulin, HOMA-IR or 2-hour postprandial glucose; pooled analyses whose designs were not recorded reported non-significant results.
Open FastingWho was studied
- People with a condition
What to avoid
Interventions recorded as making it worseNothing in this library is currently recorded as making Shift Work Sleep Disorder worse. Coverage is partial, and absence here is not evidence of safety.
How to read the evidence
Evidence tier — overall strength of the evidence for the whole compound
- StrongWell established — backed by strong, consistent human research.
- ModerateSome genuine support, but mostly from small or lower-quality studies. Promising, not proven.
- PreliminaryEarly-stage evidence — a promising hypothesis, not an established effect yet.
- LimitedVery limited evidence — treat this as a hypothesis, not proof.
- InsufficientNot enough good evidence to draw conclusions yet.
Certainty — how sure we can be that the effect is real
- Very highVery sure — strong, consistent evidence
- HighFairly sure — consistent evidence from good studies
- MediumModerately sure — new studies could change this
- LowNot sure — little or mixed evidence
- Very lowVery unsure — almost no usable evidence
Source — where the data comes from
- Meta-analysisPooled analysis of many trials — the strongest evidence
- RCTRandomized controlled trial — a strong human study design
- ClinicalA human clinical study
- Reference knowledgeFrom general health-science or pharmacology references, not a study of this exact claim
- Animal researchStudied in animals, not humans
- Community reportsAggregated user reports — anecdotal signal, not evidence
- TheoreticalMechanism-based reasoning, not yet tested
Study grade — quality of each underlying study (A best, D weakest)
- AHigh-quality — strong, consistent human trials
- BGood — solid evidence with some limitations
- CModerate — limited, small, or mixed-quality studies
- DWeak — preliminary, indirect, or animal-only
Confidence — how strongly the sources back a finding
A 0–100 score from study quality and agreement
Most supplement evidence is graded C–D. Read it as preliminary signal, not proof.
Full write-up
What is it
Shift Work Sleep Disorder is a sleep condition associated with working night shifts. It can involve difficulty obtaining good-quality sleep during the day and reduced alertness or performance while working at night. Melatonin and strategically timed Caffeine are examples of options discussed in relation to these concerns, although late Caffeine use may affect later sleep. A clinician can help assess sleep problems in the context of work schedules.
Evidence-backed options
The options associated with Shift Work Sleep Disorder address different parts of the problem. Melatonin is described in relation to daytime sleep quality and alertness in night shift workers, while strategically timed Caffeine is described in relation to alertness and performance during night shifts. Caffeine may also impair subsequent sleep when taken late, so its potential effect spans both wakefulness during a shift and sleep afterward.
The available descriptions do not specify what doses were taken, how long either option was used, or how quickly effects appeared. They also do not identify particular health-status groups, so applicability to specific individuals or circumstances is not established here. The evidence is therefore limited in detail, and the descriptions do not provide a basis for comparing the options directly or determining which is more suitable.
These options are educational reference points rather than treatment instructions. Anyone considering them for a medical condition should discuss their circumstances with a clinician, particularly when daytime sleep, nighttime alertness, or the timing of later sleep may be affected.