Personally, it is not good to put underwear under the pillow. Because underwear is placed under the pillow, the pillow will rise. Although people often say that they can sit back and relax, modern people generally realize that the pillow is too high and people's head is placed on it to sleep, which is not conducive to the recovery of blood circulation of tired cervical and carotid arteries.
If underwear is worn, where to put it, there are inevitably many bacteria on it, which is very bad for human health. If underwear is clean, it should be well stored for washing.