I work night shift and use blackout curtains and earplugs to improve my sleep during the day. Rather than cranking the volume on my alarm so it's loud enough to consistently wake me up, I use Home Assistant to turn on some smart bulbs as my alarm. When I started, and even now if I have to be up extra early, I also have an audible alarm set to go off a few minutes after the lights come on - just in case the light doesn't wake me up, but at this point my brain has gotten used to waking up to the lights, and I usually wake up and turn off the other alarm before it goes off.
Another useful automation for me is I have a buggy Samsung PC monitor that has all sorts of annoying issues; like not consistently waking from deep sleep which requires a hard power cycle to correct, and when it is asleep there's some weird high pitched whine that beeps when the standby light flashes. I use a couple of smart plugs with power monitoring and monitor my PCs power draw to turn the power to my monitor on and off at the wall depending on if the PC is on.