I'm restless , which disturbs my wife . My wife gets to get too warm , and suffers from a bad back . We are both mainly side sleepers . Our present double-sized mattress is getting old , but we want to keep our bed , which has a slatted base . Both pensioners , but , for now , still able to flip and turn the mattress . We recently spent two nights on a Premier Inn Hypnos bed , and the wife was impressed that my restlessness didn't affect her . Can you advise on what sort of mattress , and why ?