insomnia
"My insomnia has gotten out of hand recently and diphenhydramine and melatonin were no longer working for me. I received the sample pack of suvorexant from my doctor. I took 20 mg and it had absolutely no effect on me at all. Took a few hours to go to bed and woke up less than 4 hours later. What a joke! Maybe it works for others and maybe I have some problem with my thyroid for example (still waiting to receive results from my bloods) that causes this not to work for me."