My brother-in-law is in the bed more hours than he is up. The mattress that came with his rental electric hospital bed has a "hole" in it where the mattress has given in. We bought an egg crate but it has sunken into the hole as well. Looking for a new mattress that isn't too pricey but will have more support instead of giving in. The hole is making it hard for my brother-in-law to get out of his bed. Any suggestions? I have looked on line and have become more confused. Thank you!