How much did you spend on your baby when you where pregnant? Im having triplets.?
I would have difficulty believing that an effective seal against allergens would be formed by layering handy-wrap. Each time the bed is layed on, the compression would stretch the plastic and force air through the seams. Instead, shampooing your mattress might be a good idea. At a minimum, gently steaming the matress will help knock down the population of mites and denature the proteins causing allergy issues. Changing your sheets weekly and keeping pets from sleeping the bed are also good ideas. You can purchase rubber sheets. This would provide an effective barrier between the mattress and your head. Also consider that the pillow will be loaded with the mite feces that triggers allergies. Anywhere dander could fall for their food, they will be there to help get rid of it for you. I hope this helps.
Safety pins are not used for stretchy cloths. Don't use safety pins for leggings.