A hotel always had a challenge: the solo travel tended to want a single king size bed and would typically travel midweek. 

On the other hand, families or groups of friends tended to want two queen size beds. 

So that meant at any one time a typical room would go unused for some part of the week. 

Innovative hotels like Holiday Inn are now experimenting with pull out sofa beds which means they can now cater for both customers at the same time. 

It's tempting to think this would not go down well (who wants to sleep on a sofa after all?) but actually it appears if anything to be a growing trend. 

The innovation in hotels is not just tech related it seems.