To prevent overnight window condensation, you can apply clear plastic window insulation film kits using double-sided tape and a hair dryer to create a trapped insulating air barrier that keeps interior glass surfaces warmer. Additionally, placing moisture-absorbing silica gel packs or rechargeable dehumidifiers on window sills helps capture excess ambient moisture. Running a portable dehumidifier in the bedroom overnight and cracking windows slightly for cross-ventilation also significantly reduces morning glass fogging. Verification: Monitor indoor relative humidity to keep it below 50 percent.
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