The summer my apartment's air conditioning broke for three weeks, I learned more about sleep physiology than any book had taught me. Temperatures inside reached 92°F by bedtime. I tried everything—cold showers, fans pointed directly at me, freezing a pillowcase, sleeping on the kitchen floor where the evening air occasionally drifted through open windows. After those sweltering weeks, I can report definitively that hot weather sleep disruption has solutions, even without climate control. The fundamental problem with hot-weather sleep isn't discomfort—it's thermoregulation. As described earlier, your body needs to drop core temperature 1-2°F to initiate sleep. When ambient temperature is already elevated, the temperature differential your body can achieve between core and extremities decreases, making the cooling mechanism that triggers sleep onset less effective. Your body quite literally cannot cool down enough to fall asleep efficiently. Hydration becomes critical in ways that aren't obvious. You lose water through respiration and perspiration throughout the night, more when ambient temperature is high. Even mild dehydration impairs next-day cognitive performance and worsens sleep quality. The solution isn't drinking more water at bedtime—that leads to disruptive nighttime urination—but rather ensuring adequate hydration throughout the evening and maintaining it through the night with electrolyte-containing drinks if you sweat heavily. Your bedding choices matter enormously in hot conditions. Synthetic sheets trap heat and moisture against your body, creating a humid microclimate that prevents the evaporative cooling your skin attempts. Cotton, linen, or moisture-wicking performance fabrics allow heat to dissipate and sweat to evaporate. Lightweight blankets with open weaves create less insulation than heavy quilts. During heat waves, some people find that a thin cotton sheet alone provides adequate covering during sleep without overheating. Strategic ventilation timing can cool your sleeping space dramatically. On hot summer days, keep windows and curtains closed during the hottest afternoon hours to prevent heat buildup inside. Open windows and create cross-ventilation when outdoor temperatures drop below indoor temperatures—typically after 10 PM in most continental climates. Using a fan to exhaust stale hot air while drawing in cooler outside air can reduce room temperature by 5-15°F over several hours. Cooling your body directly works faster than cooling your environment. A cool (not cold) shower before bed raises skin blood flow and initiates evaporative cooling that continues after you exit. Wet hair left to air-dry provides similar evaporative cooling. Some sleepers benefit from keeping a damp washcloth on their chest or forehead during sleep—the evaporative cooling effect continues throughout the night. Pre-cooling your sleeping surface has measurable effects. Sheets and pillowcases can be dampened and placed in the freezer for 30-60 minutes before bed. The chilled fabric against your skin when you first lie down triggers the peripheral vasodilation and cooling response that initiates sleep onset. Some high-end mattress pads provide programmable cooling, but the DIY freezer approach works nearly as well for a fraction of the cost. Timing your sleep appropriately matters more in hot weather. Sleep onset is most difficult during the hottest part of the evening; as outdoor temperatures drop through the night, sleep becomes progressively easier. If your schedule permits, shifting sleep earlier (sleeping during slightly cooler late-evening hours) and waking before the worst afternoon heat produces better quality rest than attempting sleep at midnight when indoor temperatures often peak. Electrolyte balance affects thermal regulation and sleep. Sodium, potassium, and magnesium deficiencies impair your body's ability to manage heat and maintain hydration. During extended heat waves or if you sweat heavily at night, supplementing these minerals may improve both heat tolerance and sleep quality. This is particularly relevant for older adults whose electrolyte regulation is less efficient.