Melatonin will be produced anyway, it just happens much worse in the light. And yes, I agree with Igor Fedorov - melatonin-sz will help you, it will fill up the missing melatonin.
Curtain the bedroom, it is better to blackout curtains so that it is dark during sleep (melatonin is produced in the dark much better), but in general, the lack of melatonin, as already mentioned, can be replenished with melatonin-sz, in fact it is pure melatonin.
Melatonin will be produced in any case, but much less in the light, which can lead to lack of sleep. Melatonin-ss or melarrhythm to help. In St. Petersburg in summer it is actual, white nights, who have no blackout curtains.
Of course it will be, just a little less than it would be in complete darkness. In such cases, you can take 1 tablet of a melatonin-containing drug - something like melatonin-ss, melarena, etc.
Will. Just less. Still, melatonin is produced by a large number of organs of internal secretion and even in non-endocrine cells - in the blood, intestines. The forgotten light will reduce its secretion only in the pineal gland and retina - all other manufacturers are independent of light. But why do you need it? What do you like insomnia and decreased immunity?