The bedsheet aids in the absorption of the body's oils and sweat. If you don't sleep with the top sheet, you're more likely to awake feeling bumpy and uncomfortable. If you are sleeping on a mattress with no sheet, your mattress will absorb body oils and sweat that can cause staining and odors. Furthermore, bacteria could transfer from your body onto the mattress without a barrier between your body with the mattress, and this could cause an illness or worsen allergies. your skin is your biggest organ, and it is essential to protect it from bacteria and dirt. If you do not have sheets over your bed, your skin is more prone to exposure to these harmful substances, and this can cause breakouts and other skin issues. Your dead skin cells get removed every day. If you don't sleep with an overslept sheet, the dead skin cells are deposited on your mattress. In time your mattress can become dirty and stained. Another reason could be pet fur, which could end up on your mattress and make it filthy. Hair is also prone to oil and dirt. If you don't use sheets on your bed, your hair is prone to becoming filthy and filthy. This can cause issues with your scalps, such as hair loss and dandruff. In addition, dust mites easily transfer from your mattress onto your body, which can trigger allergic reactions. Because of this, it is essential to put sheets on your mattress.