In Feng Shui, a bed parallel to the window is fine. However, you should not have a window as a headboard because this is known to influnce other people to backstab you. You also will not have solid support for your decisions in life.
The main emphasis of the bedroom is location and direction. This is based on the concept of 8 mansions in feng shui.
8 mansions is based on your birthdate, and a kua is calculated. Based on this kua, you end up with 4 good directions/ locations and 4 bad ones. It is different for all people.
You should keep in mind that mere good fengshui for the bedroom/bed cannot change your life. If you like to change your life, try to move houses. If in 3 to 6 months, your life does not change, then it means that the feng shui of the house is not good for you.
The fengshui of the house is based on its door and when you moved into the house (flying star). Again there is a calculation for this. The shortcut is to get a fengshui auditor or master to do the calculations for you, so you can renew and/or correct the fengshui of your house. Long cut is to move from one house to the next, trial and error.
