Trazodone is a serotonin antagonist and reuptake inhibitor. At antidepressant doses (150-300mg) it's full-strength; at 25-100mg it's a sedating sleep aid without the dependency profile of benzodiazepines or Z-drugs.
Dose: 25-100mg at bedtime.
Caveats: Priapism (rare but serious). Morning grogginess at higher doses. Not a long-term solution to sleep architecture problems.