A person, who has symptoms including difficulty in going to sleep, feeling languid after waked up or having a hard time awaking, is desirous of a medicament and a nutritional food that can alleviate the symptoms and improve his or her health. Specifically, one object of the present invention is to provide an orally administered agent, a food and drink, or a food additive which can be used for improving the process of going to sleep and waking. An orally administered agent, a food and drink, or a food additive for improving the process of going to sleep and waking, containing ornithine or a salt thereof as an active ingredient can be provided according to the present invention.