I never sleep in my speedos. I don't like the feeling of being confined with something tight around me even though I love that feeling when I'm at the beach or swimming laps, and I always wear bikini underwear. I wear boxers and when it's cold like it is for almost 8 months in Maine, I wear a pair of sleep pants over the boxers, either cotton or flannel.

D67

yes, sometimes I do it.
in summer is cool, but not so much in winter. I prefer to sleep just wearing cotton briefs, but sometimes I wanna try some speedos, specially when taking naps.

so, here are my answers:

Any of you guys wear your speedos during the night to sleep in?
yes, sometimes

Does it feel that after a while the speedo/swimsuit starts to feel a bit weird on your body..especially the lined sections?
it feels great. my mind is focused more on the soft fabric, than the lined sections.

If there is a waist cord, do you tie it down?
yes.

Are your lovers/partners happy with it?
I'm single for now. but hope to find a girl who also likes me wearing it (actually almost no girl likes speedos nowadays)

I have only one water polo suit in my collection. this is my favouite to sleep with.