Inclusion criteria:
18-35 years of age
single
Iranian
residing in the dormitory
Having sleep quality disorder according to the Pittsburgh questionnaire
Body mass index between 18.5 and 35.
Exclusion criteria:
consuming alcohol, narcotics, or smoking
Drinking more than 4 cups of coffee per day
Any disease that affects sleep quality (narcolepsy, obstructive sleep apnea, restless leg syndrome, periodic limb movement syndrome, etc.)
Previous (4 weeks prior to study) or current use of psychotropic medications (antiaxiants, sedatives, hypnotics, antipsychotics, antidepressants, centrally acting corticosteroids, and opioid analgesics)
Use of any chemical or herbal medicine for sleep quality disorders during the study and 3 months prior to the study
Taking hormonal pills
Having jobs with night shifts
being stressed, anxious or depressed as indicated by DASS21 test
Participation in another study during the study and within one month before the intervention
sensitivity to basil extract during the study
not taking basil extract capsules for two consecutive days