26 , 30 A study assessed the chronotype of fasting individuals during Ramadan in Saudi Arabia using the Horne and Östberg questionnaire and reported a clear trend toward a decrease in morning types and an increase in evening types during Ramadan. 30 Studies that monitored body temperature as a marker of circadian pattern during Ramadan 28 , 33 , 34 reported a delay in the occurrence of acrophase and a reduction in the amplitude of core body temperature during Ramadan. 28 , 33 Two studies that assessed sleep architecture during Ramadan using polysomnography demonstrated a significant reduction in REM sleep. 29 , 33 Dreams The Islamic culture is extremely interested in dreams.
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