Yes, the product description includes jet lag, late nights, demanding work phases and times when falling asleep takes longer than usual. So it is most relevant for temporary or situational evening difficulties, not for a long-term sleep problem.
For travel, you can use it to help adjust to a new local bedtime: take one capsule shortly before you plan to sleep in the new time zone, rather than during the day or on the plane. Combined with dim light and reduced screen use, this can make the transition to local time easier. It is still important to allow enough time for a full night of sleep.
For late nights or an irregular schedule, use the same routine: one capsule only when you are ready for bed and can stay there for several hours. Because it may cause drowsiness, you should not drive or use machinery after taking it, and you should not take it before a period when you need to stay alert.
If sleep difficulties continue for weeks or begin to affect your daily life, it is sensible to talk with a doctor or pharmacist. Occasional use of a supplement like this is a short-term support; it is not a substitute for reviewing your sleep habits and the reasons behind a disturbed schedule.