How do you keep your wig on while you are........um, getting busy?

Doing any other activity, the wig stays quite snug, but in bed, the darn thing is constantly slipping and sliding!

Once, I woke up next to my SO and I felt a draft and something hairy on my arm......laaaaaawwwwd, my wig, my scarf, my pins, were all over the bed












Luckily he was passed out, I quickly grabbed my stash, jumped in the bathroom and slapped it back on my head.

We are going on vacay and I seriously don't want a repeat of that.
I wear scarves, even though they are not cute, but even those tend to come off in the middle of the night.
My absolutely last option is to use Tape....but I'm looking to see what tricks you ladies use....
Thanks!