Study to Investigate Effects of a Herbal Drug Compared to Placebo on Sleep

Inclusion Criteria: * Healthy male volunteers aged between 18 and 55 years * Normal sleeping times (at least 6 hours a night), going to sleep between 22.00 and 1.00 hours, getting up between 6.00 and 9.00 hours * Written informed consent * The volunteer is willing and able to cooperate fully * The volunteer agrees not to drink any alcohol for the duration of the study Exclusion Criteria: * Participation in another study in the last 30 days or participation in this study at an earlier date * Lack of verbal or intellectual ability to communicate adequately and to understand the information to volunteers * Legal incompetence * Smoker * Shift worker * Transatlantic flight in the last 4 weeks * Taking psychotropic drugs within the last 4 weeks * Taking medicines that influence the EEG within the last 4 weeks * Diseases that influence the sleep EEG * History of known medication / drug / alcohol misuse according to ICD-10 coding F10 - F19 * Known intolerance/hypersensitivity/allergy to St. John's wort, valerian or passionflower * Taking inadmissible concomitant medication (anxiolytic, neuroleptic or hypnotic drugs, cyclosporin, sedative, sleep-promoting or mood-enhancing medicines, antidepressants other than the trial medication, coumarin-type anticoagulants, oral contraceptives, tranquillisers, homeopathic remedies, digoxin, theophylline, indinavir, nortriptyline, amitriptyline) * Known light-sensitivity