hummung hovering then quick exit

I was only 11 or 12 and I heard this humming outside my window.At that time you had no airconditioning and you left your windows open it was the 60's mind you. I was staying overnight at my cousins house in Waukegan Ill. I heard the humming and went to the window when I saw 2-3 circular discs hovering outside my cousins window, I ducked down then peeped up over the window sill and within seconds they left. I never told anyone cause I thought they would think its teenage imagination or anxiety irationaly behavior.But I know what I saw and I've kept that buried with me for 40 yrs. To this day I know what I saw was real and haven't told anyone. I believe space continues and I was not afraid. Thank you, Kathryn Slododzian fessing up after
Source of report indicates that the date of the sighting is approximate.  PD