Many people may find it more difficult to sleep when the temperatures begin to increase due to the hot and humid ambient air. Being heated might prevent your body from entering "deep sleep" mode, depriving you of important hormones generated during the deeper phases of relaxation. Also, the stress caused by the heat might keep you awake later on. Additionally, large amounts of sunlight can cause insomnia by causing blood sugar levels to rise, which results in nervousness and anxiety. Sunlight itself isn't harmful, but excessive exposure to ultraviolet rays can lead to skin cancer. Sleeping in direct sunlight for too long could also cause wrinkles, although sleeping in a well-lit room with the window open can have similar effects. Last, but not least, a hot environment might make it harder to relax and get comfortable. Sleep needs time to repair and restore our bodies, and if we are always pressed for time because of work deadlines or other responsibilities, then we won't have enough time for proper rest. In addition, heating up your bedroom will make it harder to fall asleep since you'll be distracted by the hot temperature. A good solution is to install a ceiling fan that will help bring in some much-needed air conditioning as you sleep. If these reasons haven't convinced you to pull out the blankets and turn down the heat, then consider visiting your doctor for medication advice.