Question

Give reasons we must open window while sleeping​

Answer 1

Answer:

It's no secret that fresh air makes for a good night'ssleep. ... A cooler bedroom, at around 67 degrees, results in better sleep, but you don't want to open yourwindow too far in winter or you risk getting sick, as well as running up your heating bill

Answer 2

Answer:

We must open the window while sleeping because it is the way of ventilation so if we close the windows it may be dangerous for our life.