Decision-making After Sleep Restriction

Inclusion Criteria: * Age between 18-21 years or 26-30 years, * Right-handedness, * Good general health, * Good understanding of German language (as all information is provided in German) * Signed Informed Consent after being informed. Exclusion Criteria: * Contraindications on ethical grounds, * Clinically significant concomitant disease states (e.g., renal failure, hepatic dysfunction, cardiovascular disease, etc), * Known or suspected non-compliance, drug or alcohol abuse (\> 5dl wine/ \>1l beer daily), * Regular medication intake, * Enrolment into a clinical trial within last 4 weeks, * Diseases or lesions of the nervous system (acute or residual included neurological and psychiatric diseases), * Sleep disorders (e.g. Insomnia, sleep apnoea, restless leg syndrome, narcolepsy, etc.), * Sleep complaints in general or excessive daytime sleepiness (Pittsburgh Sleep Quality Index \> 5; Epworth Sleepiness Scale ≥ 11), * Irregular sleep-wake rhythm (e.g. shift working), * Long (\> 10 hours per night) or short sleepers (\< 7 hours per night), * Sleep efficiency \< 80% in screening night, * Travelling with time lag less than 1 month ago (or planning to do so within 1 month prior to or during the study), * \> 5 drinks or food items containing caffeine per day, * \> 5 cigarettes per day, * Body Mass Index \< 19 or \> 30 kg/m2, * Skin allergy or very sensitive skin * Student of one of the following subjects: Mathematics, Physics, Computer Science, Economics, or Psychology (since students of these subjects have profound knowledge of probability calculations, which could interfere with our measurements in decision-making). * Red-Green Colour-Blindness (as the Risk Task requires the distinction between red and green), * History of claustrophobia, * Known hearing disorder (as acoustic stimuli will be applied during sleep), * Magnetic Resonance (MR) contraindication (such as pacemaker, implanted pumps, shrapnel, etc.; full MR Screening form will be filled out).