Couple have different sleep timing but often woken up by partner's alarm clock.
Existing solution([login to view URL]) is using wristwatch/ring/bangle that send small electrical shock to wake you up, but I think this is very impractical and I guess most of us don't like to wear anything like that when sleeping.
My solution is using directional speaker(search "BBC - Audio Spotlight " in Youtube) which concentrate sound to very specific area. While your partner might still hear some sound due vibration and reflection, it still not as bad as common alarm [login to view URL] directional speaker is cheap now especially from AliBaba or any Chinese manufacturer.
I need can do design and actual product prototyping and connection with manufacturing company
10 frilansare har i genomsnitt lagt bud på $177 för detta jobb
I will give you the best possible design for the same with great comfort ergonomics and aesthetics with better refinement to details . for more details do contact