I've been a long time patient for apnea/PLMS (Periodic Limb Movement Syndrome) & have tried numerous drugs to help with the PLMS, which is a seizure disorder that makes for involuntary
"flailing" of arms & limbs (related to RLS). I take 3& 1/2 .5 mg of Clonazepam before bed. It is the only thing that allows me to sleep. Melatonin gave me Insomnia! Doxepin had side effects, but I can't remember what. Lunesta gave me nightmares. Haven't tried Unisom.
Doc's are reluctant to do Clonazepam because it is highly addictive & can lead to kidney/liver problems. I guess I've been lucky. I'm 73 & been using C. for 30 years, with none of those complications.
Good luck. Hope this helps