In addition to the other suggestions here, I'll add a wee bit about diet control of serotonin. The availability of serotonin in the brain has an important role to play in brain chemistry and mood and also sleep patterns. The amount of serotonin available to the brain is controlled by a complex body chemistry. The brain manufactures serotonin from precursors. One of those precursors is tryptophan.

Tryptophan is an amino acid, one of the protein building blocks. It is less prevalent in our typical diets than other amino acids. In essence, it "competes" with other more prevalent amino acids for a chemical ride to the brain where it can be converted to serotonin.

Tryptophan is contained in greater concentrations in foods like turkey, cheeses, chicken, beef, pork, and salmon.

It isn't enough to just eat these foods, to affect tryptophan ending up in the brain so that serotonin can be produced, however. Remember that it competes with other, more prevalent, amino acids. To aid tryptophan's journey across the blood brain barrier, it helps to eat carbohydrates along with it, as the carbohydrates tend to IMPEDE the other amino acids in their journey to the brain, and give favor to the tryptophan, for chemical reasons.

For US citizens, think of that sleepy feeling you get after a big Thanksgiving feast that includes lots of turkey AND stuffing. Why? Because of the tryptophan that goes to your brain in very significant quantities, aided by all those carbs!

That latter bit is why moderation is important in everything. You can boost your serotonin levels modestly by eating a turkey and cheese sandwich. You can over-load with a big feast of turkey and stuffing.

That is a very simplified version of a complex chemistry, but hopefully enough to understand how eating a food rich in tryptophan along with some carbohydrates will tend to boost serotonin production.

Cowgirl