The handover itself happens and I can see the call app on the iPad but the audio does not get through (neither mine nor the other person).
Latest iOS and iPad OS, tried several times and it’s the same issue.
Same wifi, Apple ID, hand off allowed etc.
I don’t have an answer to your specific question but I’m curious - if you intend to use the S5 only for sleep tracking, how does it matter if the control center is not a swipe up?