When measuring curtains for a bedroom window, there are a few things to keep in mind. First, you'll need to measure the width of the window. To do this, simply use a tape measure and measure from one side of the window to the other. Next, you'll need to measure the height of the window. Again, use a tape measure and measure from the top of the window to the bottom. Finally, you'll need to take into account how much fabric you want your curtains to have. Typically, you'll want about 2-3 times as much fabric as the width of your window so that your curtains can be full and billowy. With these measurements in hand, head to your local store or online retailer and start shopping for curtains!