Inform - Entertain (͡ ͡° ͜ つ ͡͡°). . . . . . . since 2007
Of course I have insulation in the attic. I also have blackout curtains over the window and most of the outside wall. Blackout curtains are generally a bit thicker and heavier and act as insulation.
I run the AC till the bedroom has cooled down. When I go to bed I switch off the AC and turn on an overhead fan. The room remains cool till after I get up in the morning