My husband has dementia and Parkinson disease and he wets the bed. He wears pull up briefs i.e. depends and I also, have a pad and chux to use at nighttime. My problem is he wanders doing the night and he takes his briefs off during the night and he gets off of the pad and chux during the night. My question: Is there a mattress pad or something heavy enough that will cover the whole bed, that will absorb urine and keep the bed dry at night time?