A Trial Investigating Lu AF28996 in Healthy Adult Participants

Inclusion Criteria: * The participant has a body mass index (BMI) ≥18.5 and ≤30 kilograms per meter squared (kg/m\^2) at the Screening Visit and at the Safety Baseline Visit. * The participant has a resting supine pulse ≥50 and ≤100 beats per minute (bpm) at the Screening Visit and at the Safety Baseline Visit. * The participant has a resting supine systolic blood pressure ≥90 and ≤140 millimeters of mercury (mmHg) and a resting supine diastolic blood pressure ≥50 and ≤90 mmHg at the Screening Visit and at the Safety Baseline Visit. * The participant has a normal circadian rhythm, defined as a person who usually wakes between 6:00 and 9:00 a.m. and goes to sleep between 9:00 p.m. and midnight. Exclusion Criteria: * The participant is a member of the site staff or of their immediate families or is a subordinate (or immediate family member of a subordinate) to any of the site staff. * Part B only, the participant is a woman of childbearing potential AND is using oral hormonal contraceptives. * The participant has previously been enrolled in this trial. * The participant has previously been dosed with Lu AF28996. Note: Other inclusion and exclusion criteria may apply.