The recent survey done by the students of Tribhuban University has proved the evidence that sleeping inside the stuffy room can cause the headache and sometime can take the life. They have recommended that while sleeping inside the room don't close all the window tightly in summer season let them open to let the fresh air pass. Most of the people have habit to make fire and operate heater inside the room in winter season and forget to put off the fire and turn off the heater can invite vital circumstances. So be careful about the condition. If you don't like to keep the window open by some reason such as harmful insect or noise by vehicle you had better install Aprilaire Humidifier inside the room to control the level of temperature. So that you can sleep soundly without any obstacle.