I forgot to turn on the window air conditioning system in our room when I got home, & I felt so dumb. I have a giant study room in my home that I sleep in. Since all of us have no central air conditioning system, I have to cool my study room down with a window air conditioning system. Instead of buying a massive air conditioning system that would have cost myself and others a lot of currency, I decided to buy a smaller air conditioning system for a actually cheap price. The air conditioning systems both keep the study room cool during the evening & night while I am sleeping, however the window air conditioning system that I decided to purchase takes a long time to cool my study room down. I do not let the window air conditioning system run for the entire day, so I have to turn on the window air conditioning system right when I get home. I get beach house from work a few hours before I go to bed, so if I turn on the window air conditioning system when I first get home, my room will be cool & comfortable right when I go to sleep. However, for some reason, I forgot to turn the window air conditioning system on today, however usually, I am in the habit of turning the window air conditioning system on as soon as I get home, however today, I got sidetracked with something when I got home, & I never bothered to turn the window air conditioning system on. When I walked into my study room to go to bed, I observed my mistake. My study room was actually warm, & I tossed & turned for nearly an hour before I fell asleep, because that is how long it took the window air conditioning system to cool my study room at night.