![]() ![]() However, the experimental nature of these studies does not take into account the impact of an individual’s habitual caffeine intake or sleep patterns. ![]() It can also impact sleep architecture by reducing the amount of deep sleep. Experimental laboratory studies have shown that when caffeine is ingested one to three hours before bedtime it decreases sleep efficiency, decreases total sleep time, and increases sleep onset latency. In adults there are a number of experimental studies investigating caffeine intake and its influence on sleep, with previous experimental studies finding that caffeine consumption can impact sleep quality. ![]() These benefits of sleep are not only dependent on total sleep time but also sleep quality, measured by variables such as sleep efficiency, and sleep onset latency. Sleep has been shown to be important for many different cognitive and health reasons. While sleep need is individual and can differ from person to person, it is recommended that adults obtain 7–9 h per night. Therefore, it is important to examine the impact caffeine has on our sleep to make more informed recommendations on consumption and to better understand the impact in roles where caffeine consumption is higher. Currently there are no consumption guidelines for caffeine in Australia. The Australian Bureau of Statistics (ABS) showed that on average in 2011/2012 Australian adults aged 19–70 years had daily caffeine intakes ranging between 103 and 183 mg per day, with coffee being the most common source of caffeine. Due to its action on adenosine receptors caffeine improves alertness. Caffeine is commonly used as a fatigue countermeasure. The data suggests that shorter sleep is associated with greater caffeine consumption, and that consumption is greater in adults with reduced sleep quality.Ĭaffeine is a widely consumed stimulant that is found in a variety of commonly consumed foods and beverages such as chocolate, soft drink (soda), tea, and coffee. The C-FFQ was found to be a quick but detailed way to collect population based caffeine consumption data. Participants who reported poor sleep (PSQI global score ≥ 5) consumed 192.1 ± 122.5 mg (M ± SD) of caffeine which was significantly more than those who reported good sleep quality (PSQI global score < 5 125.2 ± 62.6 mg p = 0.008). Higher total caffeine consumption was associated with decreased time in bed, as an estimate of sleep time ( r = −0.229, p = 0.041), but other PSQI variables were not. Caffeine consumption remained stable across age groups while the source of caffeine varied. In this cross sectional study, 80 adults (M ± SD: 38.9 ± 19.3 years) attended the University of South Australia to complete a C-FFQ and the Pittsburgh Sleep Quality Index (PSQI). The aim of this study was to determine the relationship between caffeine consumption and sleep quality in adults using a newly validated caffeine food frequency questionnaire (C-FFQ). Caffeine is commonly consumed to help offset fatigue, however, it can have several negative effects on sleep quality and quantity. ![]()
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