L-theanine is amazing. It is what makes up about 2% by weight of green tea and it is what causes the calming effect through GABA receptor action. It's expensive but worth every penny.
GABA itself is non-polar so it doesn't cross the BBB very well. GHB is the derivative that crosses it like hellfire and could put you in a coma, although it's just a modified GABA with a hydrogen in the gamma position of the amino acid. GABA is the only inhibitory neuroreceptor in the brain. Tolerance is expected but withdrawl is not a huge concern.
GABATROPIN is not quite gaba and not quite GHB. GHB is illegal, and phenibut is not scheduled. It's derived from a plant in russia and modified. Instead of a hydrogen atom at the gamma position, it has a phenyl ring; thus it is polar and crosses the BBB at a moderate rate. Tolerance can be achieved if taken regularly for 2-4 weeks. It's more of a "use as needed". It's fairly expensive but works great. Its also called "phenibut".
5-HTP is awesome and it will put you to sleep. No question that this should be tried at different doses until you get an effect.
Quality of sleep is improved by ZMA, which is just a proprietary blend of zinc, magnesium, and vit b6. Do not take this with calcium because they competitively bind. ZMA is cheap and helps.
Coleus Forskolli. This is a good feeling, calming, mood enhancing ayuverdic that is one of the oldest extracts around (forskolin). The quality of different extracts vary widely and the only one that seems to get it right every time is from a certain "vitamin shoppe" online.
Passiflora (Passion Flower)- Its cheap and its a natural MAOI. It is supposed to enhance mood and sleep. Its not one of my favorites but it could be yours.
KavaKava- This is awesome. There is some literature on its possibly dangerous effects on kidneys but they are all unsubstantiated and I'm skeptical of them. Kava is cheap and works fast, and works well. It's one of my favorites.
Valerian IS the cheapest thing to try. Its not one of my favorites but it could be great for someone else.
Of course nobody wants the following "opinion", but cardio, flexibility training, weight training, and nutrition should also be on your schedule to improve sleep and mood.
I also realize that all of the diet and nutrition won't change poor genetics. If you have insurance you could ask your doctor. The last resort is benzodiazapenes and hypnotics for sleep, and SSRI's for anything (evil!). I like MAOI's but nobody else seems to
Oh and some wild cards for mood: Rhodiola Rosea and Chocamine