Hmmm, Phoenix... would that work if drinking were involved? (Honestly, I'm so tempted to Google Dr. Miller's exercises!!!)
Walter, this is probably more than you want to know
, but here goes...
Emergency rooms are open at all times, 24/7, and are always associated with a hospital. They are sometimes used/misused by people as their only source of health services. Usually those are indigents with state health coupons or or people with no health insurance, but anyone can go there and some do when nothing else is open. (The stories would make your hair curl.)
Doctors' offices are open at what is considered "regular times" -- 8am-5pm on weekdays -- with possibly one open evening and mornings on Saturdays. Sometimes it can be hard to get an appointment in a hurry.
To deal with the "gap" between those, we are served by Urgent Care clinics which are (here, at least) associated with the large non-profit medical systems that run the hospitals. These "walk-in" clinics are open for extended hours (7am-10:30pm on weekdays and 7am- 6:30pm on weekends & holidays). They take all sorts of patients but mostly flu & respiratory infections, severe cuts and broken bones. Urgent Care Centers cannot handle major illness or trauma cases but will try to stablize a patient until an ambulance or medi-vac helicoptor comes and transports the patient to one of the three emergency rooms in the nearby city or even to Seattle where there is a major trauma center. Because we have so many islands and areas isolated by bridges and bodies of water, this area uses a lot of medi-vac helicoptors.
A new hospital is being built nearby and several years from completion.
That's the rundown on this community, other places in the USA are different. Healthcare is, to a large extent, a function of where practicing physicians want to live. If it is not as desirable a location, there are not so many doctors and the healthcare is not as extensive.