You can play/pause/forward/rewind music with basically any wireless earbuds (another e-waste device like smartwatch), and even wired audio gear (what you should buy) can play/pause/forward, and if you buy a Bluetooth DAC like one from Fiio, you have an accessory that lasts across multiple audio gear with a far more granular control.

A heart rate sensor device is extremely cheap to get, and lasts 10x longer than any smartwatch ever will.

If you cannot figure out basic mathematics of sleep cycles, then a smartwatch will be unable to help you. You are better off paying for the best alarm clock app, Gentle Wakeup ($6), than buying any smartwatch for "sleep recording". That app will last a literal lifetime on Android. https://www.youtube.com/watch?v=-fY6J97K67E There you go, your sleep issues are fixed unless you have sleep disorders or medical conditions.

Switching clock designs on a device that will become e-waste in 3 years is the most horrific idea you could give to anyone, to justify buying a smartwatch. A smartwatch looks very ugly compared to any classy authentic watch with a stainless steel or chrome strap, and is incomparably durable as well.