Can't. Wakame overnight will produce a lot of harmful substances or toxic substances, will have an impact on health, such as poisoning or diarrhea, abdominal pain and other gastrointestinal reactions, is not eaten. Wakame is a perennial algal plant of the genus Wakame in the family of winged algae, the algal body is brown, soft leathery; the overall outline is lanceolate; rhizomatous fixer fibrous.