| 摘要 |
The object is to develop a sleep-inducing agent and an ameliorating agent for stress-induced insomnia. Disclosed is a sleep-inducing oral preparation comprising one or more members selected from serine, phosphoserine, phosphatidylserine, lysophosphatidylserine, acetylserine (which are compounds having a serine unit) and cysteine each in an L-form.
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