No, sunscreen itself doesn't directly cause sleepiness. However, several factors related to sun exposure and individual sensitivities can lead to fatigue after applying sunscreen or spending time in the sun.
Factors Contributing to Sun-Related Tiredness:
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Salicylate Intolerance: As noted in Founder's Formula, some sunscreens contain salicylates, and individuals with undiagnosed salicylate intolerance may experience tiredness as a reaction. This is not the sunscreen causing sleepiness directly, but rather a reaction to a component within it.
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Heat and Dehydration: Spending time in the sun, even with sunscreen, can lead to overheating and dehydration. Cleveland Clinic points out that heat, humidity, excessive sweating, and poor hydration can all cause fatigue and sleepiness. This is not a direct effect of the sunscreen itself but rather a consequence of environmental conditions.
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Vasodilation: Right as Rain explains that vasodilation (widening of blood vessels) in response to heat can cause a drop in blood pressure, potentially leading to feelings of tiredness. Again, this is indirectly related to sun exposure and not the sunscreen itself.
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Other Underlying Conditions: Tiredness after sun exposure could also be related to pre-existing conditions like psoriasis, as mentioned in the American Academy of Dermatology (AAD) article, or other underlying health concerns. This is separate from the sunscreen itself.
Reddit Discussion:
A Reddit thread on r/SkincareAddiction reveals anecdotal evidence suggesting some users experience tiredness after applying chemical sunscreens. However, this does not establish a direct causal link, and the experiences may be due to the factors mentioned above.
Conclusion:
While sunscreen itself doesn't cause sleepiness, reactions to its components, the effects of heat and dehydration from sun exposure, and pre-existing conditions can lead to fatigue. It's important to consider these factors and consult a doctor if persistent tiredness is experienced after using sunscreen.
