[_98fj]

Details on the neuro-chemistry:

The mechanism for translating light into mood starts in the suprachiasmatic nucleus*, which sits right behind where your optic nerves cross.

Light-sensitive nerves trigger and transfer that information to the pineal gland, which in turn, starts breaking down serotonin to melatonin.

I dream about a brain implant that artificially stimulates the SCN. Control that stimulation and you control sleep, serotonin, melatonine, hunger, cell-growth, stress etc. etc. etc.

[0] https://en.wikipedia.org/wiki/Suprachiasmatic_nucleus

[killjoywashere]

Probably the bigger issue is Vitamin D synthesis.

[_98fj]

I don't think so.

Serotonine is the most influential neurotransmitter most animals have. You have two production sites in your body. Sleep, memory, behavioural learning, pain-regulation, appetite, blood-pressure, sexual behaviour, body-temperature are all controlled by it.