I wouldn't say sick, you might feel sick with a soar throat, snivels...ect
no
No, may be it can make your sleeping deeper
No, sleeping with an open window will not give you neck pain. It can make you cold if the weather permits. Your neck pain could be caused by sleeping in an odd position.
Yes.
It may be 1974 'Let Sleeping Corpses Lie' also known as 'Don't Open the Window'.
You can open the window for the cat and dont close it until your home.
The cat is sleeping on the window sill.
You undo a zip to open a sleeping bag.
You're just sick
yes it is possible
Open Window was created in 2004.
The Open Window was created in 1905.