For normal people, in the environment of less dose of insecticide spraying, sniffing the insecticide overnight does not cause discomfort or abnormality to the body, so it generally does not matter. Because the commercially available insecticides are basically after the national safety monitoring before they can be listed, the main ingredients are aminothrin, permethrin, cypermethrin, etc. Although these substances have a certain degree of toxicity, but in the case of a small dose of spraying, the concentration of insecticides in the environment is relatively low, and does not cause great harm to humans. But the relatively weak special people, such as infants, pregnant women, the elderly, etc., after smelling a night of high concentration, high dose of insecticide, may appear chest tightness, panic, nausea, vomiting, headache, dizziness and other uncomfortable symptoms, at this time need to immediately away from the harmful environment, to the open, open environment to breathe more fresh air, and observe whether the symptoms have been reduced. If the symptoms cannot be reduced, or even aggravated, it is necessary to seek medical treatment, because one night is not a short time, the harmful substances in the insecticide may damage the nervous system and cause some toxic reactions, easily causing irreversible damage to the brain or other body parts, so you can go to the hospital for blood tests, chest X-ray and other tests, and receive appropriate treatment under the guidance of a doctor. And in daily life should also pay attention to, should try to avoid to sprayed insecticide closed environment rest, general insecticide spraying a few minutes later, you can open the window ventilation for a period of time to reduce the concentration of harmful substances in the house, in order to avoid adverse effects on the human body.