I'm wearing only my new straps in bed for once, just to help them "break" quicker using my body heat.
Some times works, some times don't...
Seriously, its' not proper to wear your watch in bed. Doesn't look good and it's kind offensive for your culture.
Of cource many times i wake up with my watch on cause of a heavy drinking night before or work till passed out...
I wonder why you ask about. If you need to wear it for safety, you can use a small (4-5cm long) cotton "cylinder" to
cover the head. I learn this in the army as a way to protect it and keep it hidden.