Sleepovers were non-existent for me and
@Teddy02 since we had bw issues until age 10 / 11. The one sleepover I did have at age 8 (was dry at age 7, so one year of practically no nighttime accidents allowed me to go to my friend's house for my first sleepover) I woke up to a fully saturated bed! I won't go into the vast details (documented heavily in previous posts) but in a way it was good at this event to show me that I could wear bw protection and STILL sleepover at a friend's house without wetting the bed (slept over his house about 3 months later wearing full protection).
Your question about traveling and maybe sleeping over at a friend's house is coincidentally the same situation I just had start about 4 months ago. I contacted an old college friend and he invited me to his and his wife's vacation home in the mountains on one of my business trips. I am so used to wearing protection at night I said OK without thinking it through. Long story short, I stayed there for 3 nights and had to "man-up" and request to his wife that she leave the plastic mattress cover on the bed for me (it was there for their 10 year old nephew that wears some type of pull up each night when he visits). She was a bit surprised at first but after the pregnant pause of 3 seconds she said she certainly understood and said it was no problem. She commented later that she could wash any items for me each day as that was norm for them while their nephew slept over and I more or less informed her I wore some type of protection at night and told her I would let her know if I needed laundry service. I had a great time the 3 days I was there (I wore my trainers & pp but no issues any night) and our daily conversations never steered towards anyone's nighttime sleepwear
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The bottom line is people will want you to sleepover because they LIKE you and should not dis-like you due to your sleeping nightwear. My gosh, you and
@DreamerBen have the same backgrounds that easily explain the medical reasons why you wear protection - your friends should easily understand this. If staying with friend's at a stranger's house, just pack the night time protection you need and keep it discreet as needed. If someone notices tell them you sometimes have OAB bathroom issues at night and your underpants help with this challenge. Ask them to keep it confidential, I bet they will.
You can read my details in a post I did a few months back on this topic. I was asking this forum and our illustrious panel of supporters, the same topic questions you have. Even more surprisingly, in a follow-up Christmas card my friend's wife noted she could buy me a package of "nighttime enuresis" underpants if I stay longer next time and it would be easier in terms of bulk of me not having to pack a 7 day allotment in my suitcase. She is a Physical Therapist (of some type and probably knows plenty of adults that wear some form of protection) and I think she gets a big discount at some medical stores in Arizona and she does this for her nephew. Most people can be more accommodating then you think.