During Ramadan fasting, melatonin levels tend to be lower at night, even when the body's daily rhythm is maintained. This may be due to eating at night and could be linked to worse sleep and changes in blood sugar control.

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Evidence from Studies

Supporting (1)

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The Window Matters: A Systematic Review of Time Restricted Eating Strategies in Relation to Cortisol and Melatonin Secretion

Systematic Review

2021 Jul 23

During Ramadan fasting, people eat only at night, and this study found that their melatonin (the sleep hormone) drops significantly — meaning it’s harder to sleep well. This supports the idea that eating late at night might mess with your body’s natural sleep and metabolism rhythms.

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Source Study

The Window Matters: A Systematic Review of Time Restricted Eating Strategies in Relation to Cortisol and Melatonin Secretion

Score: 26

DOI: 10.3390/nu13082525

Similar Assertions

During Ramadan fasting, when eating is limited to nighttime hours, levels of the sleep hormone melatonin decrease at night, and the daily pattern of the stress hormone cortisol shifts—rising in the evening and falling in the morning—which may affect sleep and metabolic processes.

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88%

During Ramadan fasting, cortisol levels at night tend to be higher than usual, while morning cortisol levels are lower, which may indicate a disruption in the body’s natural daily hormone cycle and could be related to changes in metabolism and sleep patterns.

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73%