2.1. Participants
sleep disorders, anxiety, ’ habitual caffeine, psychiatric, depression
Thirty-seven subjects, aged between 18 and 55 years, were included in this study. The subjects did not have medical, psychiatric, or sleep disorders. Other exclusion criteria included physical, sleep, or mental health troubles based on (I) the hospital anxiety and depression scale (HAD)(≥11) [The subjects’ habitual caffeine consumption was assessed using a questionnaire [