Sorry you are having trouble sleeping. Melatonin might be worth a shot and it is very safe with few reported side effects. I’m attaching the following regarding the pharmacology if you were interested. Good luck!
PHARMACOLOGY — Melatonin is a hormone secreted from the pineal gland in a 24-hour circadian rhythm, regulating the normal sleep/wake cycle. As a supplement, melatonin has both phase-shifting and sleep-promoting properties. In addition to promoting sleep, physiologic roles of melatonin include regulation of the secretion of growth hormone and gonadotropic hormones. It also possesses antioxidant activity.
No known toxicity or serious side effects reported; however, long-term human studies have not been conducted. Excessive dosages may cause morning sedation or drowsiness.
Use with caution in individuals with a history of bleeding, hemostatic disorders, or drug-related hemostatic problems; in individuals taking anticoagulant medications, including warfarin, aspirin, aspirin-containing products, NSAIDs, or antiplatelet agents (eg, ticlopidine, clopidogrel, dipyridamole); and in individuals taking antidiabetic agents. Melatonin may reduce glucose tolerance and insulin sensitivity.