I have a couple of automations running, but my favourite is one of the simpler ones:

When I set an alarm on my phone all lights turn off except for a single night light (LEDs under my bed), and when I then put my phone down on the wireless charger near my bed (I only use that one wireless charger, so the automation just checks for any wireless charger), the light turns off completely and my phone screen turns off.

If I remove the phone from the charger before my alarm’s gone off, the night light turns back on, putting it back on the charger turns the night light back off, etc.

The automation does multiple useful things at once:

• I haven’t used a light switch at home in forever
• I haven’t forgotten to set an alarm in forever
• I get very obvious feedback that my phone starts charging
• I have a night light that’s easily turned on/off, without the need for motion sensors in the bedroom that could have false positives
• I have a clear trigger for when I’m in bed, that I’m using for example for my white noise machine that turns on for 45 minutes when I go to bed