Methods of improving subjective sleep efficiency, reducing subjective sleep onset latency, and/or reducing subjective wake after sleep onset in subjects comprising administering to the subject 5 mg or 10 mg of lemborexant or an equivalent dose of a pharmaceutically acceptable salt thereof are disclosed herein. Also disclosed herein is lemborexant or a pharmaceutically acceptable salt thereof for use in improving subjective sleep efficiency, reducing subjective sleep onset latency, and/or reducing subjective wake after sleep onset in a subject comprising administering to the subject 5 mg or 10 mg of lemborexant or an equivalent dose of a pharmaceutically acceptable salt thereof.
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