Hi Dr Sumit, I sprayed chemicals while cleaning our bathroom last night but although I used the fan to remove the smell, I know I didn’t wash the tiles thoroughly as I was in a hurry so we could really smell the bleach. When we slept, the fan was still on and the window in the bathroom was still open but around midnight when hubby got to bed, he turned off the fan and closed all windows. In the morning I woke up with dry throat and need to drink a lot of water and my eldest son started coughing. Is this something that I need to worry about? I know it was wrong to clean during night time but I’m into this situation now. Please give me your thoughts as I’m a bit worried. Thanks Nelia