Tree frog on the outside of the window

Big decision tonight was if I should close the windows.  It wasn't going to rain.  The temp though would get down into 40's/50's.  The problem was gray tree frogs (they might be Cope's tree frogs - hard to tell).  The little frogs like to climb up and sit atop open window sills.  If I close my casement windows I run the risk of squeezing the little fellas to death.  Seemed a shame when they eat insects and are 'environment enrichment' for the cats who try to catch the frogs as the scooch up the outside of the windows.  In the dark it's not easy to see if they are perched on the top (or sides) of the window and I'm a bit too squeamish to go outside and run my hand over the edge of the windows feeling for soft moist bodies.   I left the windows open.  I didn't want to remake my bed w/ the electric blanket either - it is still August and there are standards to be maintained.  However, even if Blitz and Whip snuggled up against me in bed, it would get too cold sometime at those temps.  Instead I dug out a big old black quilt that I have stashed away for when the winter gets really cold.  Threw it over the top of the bed.  Both I and the frogs should have a good night.