I WOULD SAY YES...FROM PERSONAL EXPERIENCE.
it gives me the shivers just thinking back on it.
it went on from the time i was 5 to about 10 or 11 years old. it was always either behind the window outside above my head or in my closet. i only saw it once. i was around 8 or 9 years old. it was about 7 feet tall, wispy and misty like a cloud, grayish, white, and black, and had very large red eyes. it just came out of my closet and hovered there for about a minute, then went back in my closet. i was petrified. my parents never believed me.
sorry, i can't talk about it anymore. i hope this helped.