Just out of curiosity and not judgement in anyway, can someone who doesn't want their cabin serviced just explain generally why not?
I get the whole if someone is sick and just would like to be left alone.
I travel a lot with work, work weird hours and stay in many hotels and if I'm back say early in the morning after a long overnight shift, or if I'm taking a nap in the middle of the day, I just put the door hanger do not disturb out and let them service the room if and when they can around me.
But I don't understand why not let them make the bed (who doesn't like a freshly made bed to sleep in?), and please note I am not judging anyone!
I can answer for our family. Our reasons are probably rather different than most.
I have a suppressed immune system thanks to medication. I also have severe food allergies. So, one of the first things we do in a bedroom that is not at our home is to use disinfecting wipes to wipe down a whole bunch of surfaces. (I don't normally do walls, but I do do things like dresser, desk and countertops, handles, switches, the phone, the remote control, ... we don't walk in sock or bare feet in the room except in the shower itself). It takes a bunch of wipes to do. I would rather not repeat it more than necessary.
I have severe allergies to many things, and sensitivities to others. For example, I get rashes and sometimes worse from pretty much all laundry detergent (for home use, I have found ONE detergent I can use without problems). I am also really allergic to dust mites. So, I bring my own pillow (with an allergen barrier), an allergen barrier for the bed, and an Allersac (
http://allersac.com/) that is laid on top of the turned down bedding and allergy barrier. I sleep in the Allersac. For long trips, I will wash it at least once. But, as with bed linens at home, it works just fine for several nights. I make up my own bed so it is tidy. Also, since it is just me in the bed, sometimes I will lay out some things on the other half of the bed and it is nice to just be able to leave them there.
I sometimes bring my own towel. I have gone and done laundry (2 full cycles; we always bring our own detergent) with hotel towels that were too irritating. I do bring my own microfibre hair towel for wrapping as it makes managing my hair soooooo much easier.
Finally, some/most of the cleaning chemicals hotels use are also irritants. Minimizing exposure to them is good.
I of course bring my own toiletries, including soap for washing hands (we use a liquid soap; easier, less mess; and portable when changing accommodations, eg split stay or hotel and cruise).
For our stay at the Hyatt MCO the night before our cruise, we are going to stay in one of their Pure rooms. I am hoping we will like it, and I am looking forward to try sleeping *in the hotel linens* *with the hotel pillow*

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Finally, privacy. But really, all the other reasons are much more significant.
-SW