TB is highly contagious and can be transmitted from an infected person to an uninfected person, mainly when a person with TB coughs, sneezes, speaks, or even sings (known as airborne transmission or airborne disease). Other people who breathe in the aerosolized bacteria can become infected.
Umm, its bad I think.
Lack of sleep can lead to many diseases and problems. Sleep is one of the basic requirement like food, water and air.
Answer:
yes of course they have always been able to do it
