Dryer sheets do not kill bed bugs but is one of the most effective natural bed bug repellents. It is best not to rely only on dryer sheets to get rid of these pests but to adapt other natural ways mentioned above that can actually kill bed bugs.
Using heat to get rid of bed bugs is very effective, however you need to use the right forms of heat to avoid burning your mattress. Use heat to exterminate bed bugs with tips from a professional
Heat treat clothing, bedding, and other items that can withstand a hot dryer (household dryer at high heat for 30 minutes), which will kill bed bugs and eggs. Washing alone might not do the job. Store clean items in a sealed plastic bag to ensure they remain bug free
30 minutes in a dryer that reaches 120F (~49C) will kill bed bugs. To determine if your dryer meets this standard, I would get a rapid-read thermometer (infrared or one used to take a child's temperature), open your machine after 30 minutes in the dry cycle, and take the temperature of the middle of the pile of (probably still damp) clothes.
Set the hair dryer to the highest heat setting. Bed bugs cannot survive at a temperature greater than 113 degrees Fahrenheit. Turn the dryer on. Begin directing the hot air over target areas for bedbugs. Pay extra attention to mattress seams and other crevices where bedbugs might lay their eggs.
Bed bugs are capable of living up to two to three months without a blood meal. In colder temperatures, however, these pests can survive up to a year without food, since they are cold-blooded and their metabolism can slow down. Under normal circumstances, bed bugs feed once every five to ten days.