The primary purpose of this phase Ⅰb/Ⅱ study is to investigate the safety, tolerability, pharmacokinetics (the study of the way a drug enters and leaves the blood and tissues over time) after multiple dose administration and the efficacy of HS-10506 (change versus placebo) on latency to persistent sleep (LPS) measured by polysomnography (PSG) in Chinese adult participants with insomnia disorder.