You might consider taking (30-60 min before bed):
145mg Magnesium Threonate or 200mg Magnesium Bisglycinate
50mg Apigenin
100-400mg Theanine
(3-4 nights per week I also take 2g of Glycine and 100mg GABA.)
*I would start with one supplement (or none!) and then add one at a time as needed. Some people do not need any supplements, and some people like theanine but not magnesium, etc. so you have to determine what is best for you.
**Don’t take theanine if you have overly intense dreams, sleep-walk, or have night terrors.
***Also, some people (~5%), get an agitated stomach from magnesium supplementation, in which case, do not take it.